ID	ModifiedOn	Contributors	InformalClassification	Family	TaxonID	TaxonName	SeeAlso	NameRank	Hybrid	TerminalTaxon	Excluded	Peripheral	Waif	Endemic	Extirpated	OriginCode	Origin	Distribution	Voucher	Comments
5824	2018-05-02 22:04:00		Vascular Plants: Monocots	Potamogetonaceae	160935	Potamogeton	Stuckenia	genus		N	N	N	N	N	N	N	Native			
5825	2023-09-16 12:43:16		Vascular Plants: Monocots	Potamogetonaceae	160936	Potamogeton alpinus		species		Y	N	N	N	N	N	N	Native	Occurring on both sides of the Cascades crest in Washington;	{"Herbarium":"WTU"}	FNA22: "Plants of Potamogeton alpinus often are red whenever taken from the water, a feature that makes this species quite distinctive.<br><br>Two varieties, Potamogeton alpinus var. tenuifolius and var. subellipticus, have been recognized in North America, based mainly on submersed leaf shape. Plants bearing both leaf types have been observed in the same population; hence the varieties are not recognized.<br><br>Four hybrids, Potamogeton alpinus × P. nodosus (= P. ×subobtusus Hagström), P. alpinus × P. gramineus (= P. xnericius Hagström), P. alpinus × P. praelongus (= P. ×griffithii A. Bennett), and P. alpinus × P. perfoliatus (= P. ×prussicus Hagström), have been described."
5826	2023-09-16 12:49:21		Vascular Plants: Monocots	Potamogetonaceae	160942	Potamogeton amplifolius		species		Y	N	N	N	N	N	N	Native	Occurring on both sides of the Cascades crest in Washington;	{"Herbarium":"WTU"}	FNA22: "Potamogeton amplifolius is common throughout much of North America. Its submersed leaves are larger than those of most other species of Potamogeton, are arcuate, and have more veins than do any other species.<br><br>One hybrid, Potamogeton amplifolius Â´ P. illinoensis (= P. Â´ scoliophyllus Hagström), has been described."
5827	2023-09-16 12:53:56		Vascular Plants: Monocots	Potamogetonaceae	160944	Potamogeton berchtoldii		species		Y	N	N	N	N	N	N	Native	Occurring on both sides of the Cascades crest in Washington;	{"Herbarium":"WTU"}	FNA22: "Potamogeton pusillus subsp. tenuissimus is the most common linear-leaved subspecies of the family in temperate North America. Whenever one finds a linear-leaved pondweed with 1--5 rows of lacunae on each side of the midvein, chances are that it is subsp. tenuissimus.<br><br>Only Potamogeton obtusifolius could be confused with the taxon, and it can be separated by having its cylindric inflorescence, whereas subsp. tenuissimus has a capitate inflorescence."
5828	2023-09-16 12:55:38		Vascular Plants: Monocots	Potamogetonaceae	160963	Potamogeton crispus		species		Y	N	N	N	N	N	I	Introduced from Eurasia	Widely dsitributed on both sides of the Cascades crest in Washington;	{"Herbarium":"WTU"}	FNA22: "Potamogeton crispus, an introduced species, has spread throughout much of North America. The expansion of this species\\\'s range from its original collection in North America, apparently about 1840, has been discussed (R. L. Stuckey 1979). This is the only species of pondweeds in North America with serrate leaves and consequently it is easily recognized.<br><br>Life history of Potamogeton crispus is unusual as it flowers and fruits in late spring and early summer, at which time it also produces turions. The plants decay shortly after those structures develop, leaving only fruits and turions, which survive the summer. No one has observed any seed germination, but the turions (referred to as dormant apices) germinate in late summer or fall, and the plants overwinter as small plants only a few cm centimeters in size, even under the ice in northern climates (R. L. Stuckey et al. 1978). Growth then continues as the water begins warming in the spring.<br><br>One hybrid, Potamogeton crispus Â´ P. praelongus (= P. Â´ undulatus Wolfgang ex Schultes & Schultes f.), has been described."
5829	2023-09-17 07:52:43		Vascular Plants: Monocots	Potamogetonaceae	160969	Potamogeton epihydrus		species		Y	N	N	N	N	N	N	Native	Occurring on both sides of the Cascades crest in Washington;	{"Herbarium":"WTU"}	Peck has authorship incorrect: "C. & B."<br><br>FNA22: "Two varieties, Potamogeton epihydrus var. epihydrus and var. ramosus, have been recognized. These prove not to be distinct. Both varieties often grow in the same body of water in the same population. The wider-leaved plants often occur in more alkaline waters. Two hybrids, P. epihydrus var. nuttallii × P. gramineus and P. epihydrus × P. nodosus (= P. ×subsessilis Hagström), have been described.<br><br>Potamogeton epihydrus is a common species of lakes and streams of northern United States and southern Canada. It extends southward in the eastern United States to Louisiana and Alabama. Potamogeton epihydrus is one of our more easily recognized species: it has floating leaves, linear submersed leaves, and fruits with an embryo with one full spiral or less. The only other North American pondweed with a similar set of characteristics is P. tennesseensis, which differs from P. epihydrus by the former having long tapering apices in the submersed leaves whereas the latter has blunt to acute apices."
5830	2023-09-17 07:55:59		Vascular Plants: Monocots	Potamogetonaceae	160975	Potamogeton fibrillosus		species		Y	N	N	N	N	N	N	Native	Occurring west of the Cascades crest in Washington;	{"Herbarium":"WTU"}	Known in WA from one collection in 1933 from Pierce Co.<br><br>FNA22: "Potammogeton foliosus subsp. fibrillosus is known from the warm waters of the northwestern United States. It differs from subsp. foliosus by the stipular tissue between the veins decomposing, leaving only strands formed by the fibrous veins. In addition, nodal glands are quite common."
5831	2023-05-05 14:57:19		Vascular Plants: Monocots	Potamogetonaceae	160981	Potamogeton foliosus		species		Y	N	N	N	N	N	N	Native	Occurring on both sides of the Cascades crest in Washington;	{"Herbarium":"WTU"}	FNA22: "Potamogeton foliosus subsp. foliosus is probably the most common linear-leaved species of the family in North America, and it is probably the easiest to determine. Any linear-leaved Potamogeton specimen with fruits having an undulating winglike abaxial keel most likely is this taxon."
5832	2023-09-17 08:04:16		Vascular Plants: Monocots	Potamogetonaceae	160986	Potamogeton friesii		species		Y	N	N	N	N	N	N	Native	Occurring chiefly east of the Cascades crest in Washington;	{"Herbarium":"WTU"}	FNA22: "Potamogeton friesii is a fairly common linear-leaved species, especially of calcareous waters of lakes and streams of the upper Midwest. Whenever turions are present, the species is easily identified, as it is the only one with the outer leaves of the turions having corrugate bases and the inner leaves turned at right angles to the outer leaves.<br><br>Two hybrids, Potamogeton friesii x P. pusillus (= P. x pusilliformis Fischer [P. Â´ intermedius Fischer]) and P. friesii x P. obtusifolius (= P. x semifructus A. Bennett ex Ascherson & Graebner), have been described."
5833	2023-09-17 08:08:22		Vascular Plants: Monocots	Potamogetonaceae	160991	Potamogeton gramineus		species		Y	N	N	N	N	N	N	Native	Occurring on both sides of the Cascades crest in Washington;	{"Herbarium":"WTU"}	FNA22: "Seven hybrids, Potamogeton gramineus Â´ P. nodosus (= P. Â´ argutulus Hagström), P. gramineus Â´ P. richardsonii (= P. hagstroemii A. Bennett [as hagstromii]), P. alpinus Â´ P. gramineus (= P. Â´ nericius Hagström), P. gramineus Â´ P. perfoliatus (= P. Â´ nitens Weber [P. Â´ subnitens Hagström]), P. gramineus Â´ P. natans (= P. Â´ sparganiifolius Laestadius ex Fries), P. gramineus Â´ P. illinoensis [= P. Â´ spathuliformis (J. W. Robbins) Morong)], and P. gramineus Â´ P. praelongus (= P. Â´ vilnensis Galinis), have been described.<br><br>Three varieties were recognized (E. C. Ogden 19435) and treated (M. L. Fernald 1950). These varieties, Potamogeton gramineus var. gramineus, deletion}P. gramineus var. myriophyllus, and P. gramineus var. maximus, were said to be separated by the shape and size of the submersed leaves. We have studied many populations of this species in the field and have observed on several occasions that a single population has leaf morphology variable enough to include all three varieties. We have, , therefore , chosen not to recognize any infraspecific categories for this species."<br><br>KZ99 mistakently places German P. heterophyllus as a synonym of New World P. illinoensis
5834	2023-09-17 08:12:31		Vascular Plants: Monocots	Potamogetonaceae	161007	Potamogeton illinoensis		species		Y	N	N	N	N	N	N	Native	Occurring on both sides of the Cascades crest in Washington;	{"Herbarium":"WTU"}	FNA22: "Potamogeton illinoensis and P. gramineus are often difficult to separate. Certainly, in the extreme of each they are easily separated, but they continually grade into each other. Features to look for are the acute-mucronate apex of the submersed leaves of P. illinoensis and the acuminate apex for P. gramineus. Also, the number of veins seems to work as well.<br><br>Three hybrids, Potamogeton illinoensis x P. nodosus (= P. x faxonii Morong), P. amplifolius x P. illinoensis (= P. x scoliophyllus Hagström), and P. gramineus x P. illinoensis [= P. x spathuliformis (J. W. Robbins) Morong], have been described."
5835	2023-09-17 09:25:03		Vascular Plants: Monocots	Potamogetonaceae	161012	Potamogeton natans		species		Y	N	N	N	N	N	N	Native	Occurring on both sides of the Cascades crest in Washington;	{"Herbarium":"WTU"}	FNA22: "Potamogeton natans is the common floating-leaved pondweed of the north temperate ure areas. It is essentially circumboreal and can easily be identified by floating leaves that are almost always cordate at the base of the blade, the petiole with a short band of light tissue at its apex, and the submersed phyllodial leaves. Also, the apex of the petiole usually is bent so that the blade appears oriented in the opposite direction from which the petiole appears to be oriented.<br><br>One hybrid, Potamogeton natans x P. nodosus (= P. x schreberi Fischer [P. x perplexus A. Bennett]), has been described."
5836	2009-04-06 08:25:00	Peter F. Zika	Vascular Plants: Monocots	Potamogetonaceae	161013	Potamogeton nericius		species	Named	Y	Y	N	N	N	N				{"Herbarium":"Not at WTU;  WS?"}	reported for WA in 1943 Contributions from the Gray Herbarium (KZ99)
5837	2023-09-17 09:29:14		Vascular Plants: Monocots	Potamogetonaceae	161019	Potamogeton nodosus		species		Y	N	N	N	N	N	N	Native	Occurring on both sides of the Cascades crest in Washington;	{"Herbarium":"WTU"}	FNA22: "Six hybrids, Potamogeton gramineus x P. nodosus (= P. x argutulus Hagström), P. illinoensis x P. nodosus (= P. x faxonii Morong), P. nodosus x P. richardsonii (= P. x rectifolius A. Bennett), P. natans x P. nodosus (= P. x schreberi Fischer [P. x perplexus A. Bennett]), P. alpinus x P. nodosus (= P. x subotusus Hagström), and P. epihydrus x P. nodosus (= P. x subsessilis Hagström), have been described.<br><br>Potamogeton nodosus is a common floating-leaved species throughout much of the United States and southern Canada. When both submersed and floating leaves are present, it is very easily recognized by the petioles of the submersed leaves being longer than 5 cm."<br><br>Stem anatomy is useful to distinguish P. nodosus from the hybrid P. gramineus × natans (BCIL7)
5838	2023-09-17 09:34:25		Vascular Plants: Monocots	Potamogetonaceae	161021	Potamogeton obtusifolius		species		Y	N	N	N	N	N	N	Native	Occurring west of the Cascades crest in Washington;	{"Herbarium":"WTU"}	Often mistaken for P. friesii.<br><br>FNA22: "Potamogeton obtusifolius is a distinctive linear-leaved species with the leaf blades round at the apex, especially when fruiting inflorescences 5--7 mm wide are present. This is unusually wide for one of the linear-leaved species.<br><br>Two hybrids, Potamogeton obtusifolius x P. pusillus (= P. x saxonicus Hagström) and P. friesii x obtusifolius (= P. x semifructus A. Bennett ex Ascherson & Graebner), have been described."
5839	2023-09-17 09:39:15		Vascular Plants: Monocots	Potamogetonaceae	161031	Potamogeton praelongus		species		Y	N	N	N	N	N	N	Native	Occurring on both sides of the Cascades crest in Washington;	{"Herbarium":"WTU"}	FNA22: "Potamogeton praelongus is one of the easiest pondweeds to identify with its submersed leaves only clasping the more or less zigzagged stem. The persistent, hugelarge, white stipules provide another clue to this species.<br><br>Four hybrids, Potamogeton perfoliatus x P. praelongus (= P. x cognatus Ascherson & Graebner), P. alpinus x P. praelongus (= P. x griffithii A. Bennett), P. crispus x P. praelongus (= P. x undulatus Wolfgang ex Schultes & Schultes f.), and P. gramineus Â´ P. praelongus (= P. x vilnensis Galinus), have been described."<br><br>BCIL7 incorrectly gives author as: "Wolfg."
5840	2009-04-06 08:39:00	Peter F. Zika	Vascular Plants: Monocots	Potamogetonaceae	161040	Potamogeton pusillus		species		Y	N	N	N	N	N	N	Native		{"Herbarium":"WTU"}	FNA22: "Potamogeton pusillus subsp. pusillus is nearly worldwide. When it is in fruit, the inflorescence is interrupted. That character combined with its narrow, linear, 1--3-veined leaves makes this taxon easily recognized. The nodal glands are green, essentially the color of the stems. Often appearing only as bumps on the stem at the nodes, they are difficult to see. Also, because the glands frequently occur at only a few nodes per plant, one can easily overlook them."
5841	2023-09-17 10:06:11		Vascular Plants: Monocots	Potamogetonaceae	161047	Potamogeton richardsonii		species		Y	N	N	N	N	N	N	Native	Occurring on both sides of the Cascades crest in Washington;	{"Herbarium":"WTU"}	FNA22: "Potamogeton richardsonii is quite similar to P. perfoliatus. Specific characteristics to separate the two species are the shape of the leaf blade apex, acute in P. richardsonii and obtuse in P. perfoliatus, and the condition of the stipules, disintegrating between the veins leaving fibrous strands in P. richardsonii , and the entire stipule, including the veins, disintegrating in P. perfoliatus.<br><br>Two hybrids, Potamogeton gramineus x P. richardsonii (= P. x hagstroemii A. Bennett [as hagstromii]) and P. nodosus x P. richardsonii (= P. x rectifolius A. Bennett), have been described."
5842	2023-09-17 16:11:14		Vascular Plants: Monocots	Potamogetonaceae	161048	Potamogeton robbinsii		species		Y	N	N	N	N	N	N	Native	Occurring on both sides of the Cascades crest in Washington;	{"Herbarium":"WTU"}	FNA22: "Potamogeton robbinsii is our most easily recognized species when it is fertile. It is the only species with branched inflorescences. The species, however, occurs in fairly deep water, forming large colonies that essentially cover the substrate. Only rarely do the plants flower. It also is the only species with truly auriculate leaves, the blades forming small lobes projecting past the stem on each side of the stem. Leaf blades of other Potamogeton species may have slightly rounded bases, but no others have lobes that actually protrude past the stem.<br><br>The species has a fairly large disjunction; primarily known from the northern part of the flora, it also occurs in the Tensas River area, Baldwin County, Alabama. The Alabama population has been collected on at least two occasions over 40 years, once as recently as 1970.<br>"
5843	2023-09-17 16:14:54		Vascular Plants: Monocots	Potamogetonaceae	161062	Potamogeton strictifolius		species		Y	N	N	N	N	N	N	Native	Occurring east of the Cascades crest in Washington, where known only from Okanogan County;	{"Herbarium":"WTU"}	First specimen for state collected in 2017 in Okanogan County.
5844	2023-09-17 09:15:25		Vascular Plants: Monocots	Potamogetonaceae	161075	Potamogeton zosteriformis		species		Y	N	N	N	N	N	N	Native	Occurring on both sides of the Cascades crest in Washington;	{"Herbarium":"WTU"}	FNA22: "One hybrid, Potamogeton zosteriformis x P. strictifolius, has been described and has been given the name P. ×haynesii Hellquist & G. E. Crow and is known from northern Michigan, Minnesota, Vermont, and southern Canada."
5845	2009-04-06 08:55:00	Peter F. Zika	Vascular Plants: Monocots	Potamogetonaceae	161076	Potamogetonaceae	Ruppiaceae	family		N	N	N	N	N	N	N	Native			FNA22: "The family has historically been considered to consist of two genera, Potamogeton and Groenlandia. Recent molecular evidence (D. H. Les, unpublished), combined with existing morphologic evidence, indicates that Potamogeton in the broad sense actually represents two separate lineages. We recognize those lineages at the generic level, Potamogeton in the strict sense and Stuckenia. Consequently, we accept three genera in the family, Potamogeton, Stuckenia, and Groenlandia.<br><br>Reproductive features are most important in separating species of Potamogeton (R. R. Haynes 1978), and we include the entire family here. The keys may not always utilize reproductive features, but they are based on fruiting individuals. We strongly recommend that no one collect specimens of Potamogetonaceae that are lacking reproductive structures.<br><br>Leaves of Potamogetonaceae are stipulate. The stipules form a tubular sheath (stipular sheath) around the stem, free from or adnate to the base of the blade. In some species the leaf and sheath of submersed leaves are adnate for part of their length, and the leaf appears to have a sheathing base with an adaxial ligule at the junction of sheath and blade or petiole.<br><br>Fruits of Potamogetonaceae are drupaceous. The fruits do have endocarps but do not have fleshy mesocarps. Mesocarps exist but never become fleshy. Consequently, the fruits are not true drupes, they are drupaceous.<br><br>Many species of Potamogetonaceae undergo extensive vegetative reproduction either by turions or stem fragmentation. Turions are excellent modes of vegetative reproduction. The structures are produced at the stem tips and eventually fall to the substrate, either by a portion of the stem breaking off or by the stem itself falling to the substrate. The turions survive an unfavorable season, germinate, and grow into new plants during the next growing season. Because the unfavorable season is usually winter in North America, turions have been called "winter buds." At least one species, Potamogeton crispus, produces turions in early summer, and the turions survive the unfavorable season (summer, in this instance), germinating in the fall. The plant then survives the winter as a young individual, only a few centimeters long, even under ice, and begins growth as the water warms in the following spring. "Winter bud" is certainly not the correct term for P. crispus. The term "turions" designates all such structures, regardless of the unfavorable season."
5846	2018-05-02 22:04:00		Vascular Plants: Monocots	Potamogetonaceae	161078	Stuckenia		genus		N	N	N	N	N	N	N	Native			
5847	2018-05-02 22:04:00	Peter F. Zika	Vascular Plants: Monocots	Potamogetonaceae	161083	Stuckenia filiformis		species		Y	N	N	N	N	N	N	Native		{"Herbarium":"WTU"}	
5848	2023-09-16 10:47:34		Vascular Plants: Monocots	Potamogetonaceae	161107	Stuckenia pectinata		species		Y	N	N	N	N	N	N	Native	Occurring on both sides of the Cascades crest in Washington;	{"Herbarium":"WTU"}	FNA22: "The sago-pondweed is among the most important species as food for waterfowl (E. Moore 1913). The species reproduces vegetatively by underground tubers and is spread by various duck species, especially canvas backs. In a study of food for ducks, a population of canvas backs was observed feeding in aquatic vegetation comprised of several genera, including sago-pondweed. When the stomach contents were examined, they were found to contain essentially 100% tubers of sago-pondweed (E. Moore 1913).<br><br>Two hybrids with this species as a putative parent have been described under the genus Potamogeton. These are P. pectinatus x P. vaginatus (= P. x bottnicus Hagström) and P. filiformis x P. pectinatus (= P. x suecicus K. Richter)."
5850	2018-05-02 22:04:00		Vascular Plants: Monocots	Potamogetonaceae	161116	Zannichellia		genus		N	N	N	N	N	N	N	Native			
5851	2023-09-17 16:17:30		Vascular Plants: Monocots	Potamogetonaceae	161118	Zannichellia palustris		species		Y	N	N	N	N	N	N	Native	Occurring on both sides of the Cascades crest in Washington	{"Herbarium":"WTU"}	FNA22: "Outside of Europe most Zannichellia are considered to be Z. palustris (W. Van Vierssen 1982). In Europe three species have been recognized based on stamen length, fruit length, podogyne length, and the rostrum to fruit length ratio. For Z. palustris in Europe the mean rostrum length is 0.78 Â± 0.20deletion} mm, the mean podogyne length is 0.4 Â± 0.19 mm, and the rostrum to fruit ratio is less than 0.5 (W. Van Wierssen Vierssen 1982). North American Zannichellia does not match any of these figures exactly. In North America Zannichellia has been considered historically to comprise only one species, which has been called Z. palustris. Until further research determines the range of Zannichellia and species delimitations, we are continuing to consider all North American material to be monospecific and am are applying the name Z. palustris to our that material."
26745	2025-03-15 12:35:01		Vascular Plants: Monocots	Potamogetonaceae	160967	Potamogeton diversifolius		species		Y	N		N	N	N	N	Native	Occurring west of the Cascades crest in Washington;	{"Herbarium":"WTU"}	Recently (2024) collected in Clark County, WA.
