ID	ModifiedOn	Contributors	InformalClassification	Family	TaxonID	TaxonName	SeeAlso	NameRank	Hybrid	TerminalTaxon	Excluded	Peripheral	Waif	Endemic	Extirpated	OriginCode	Origin	Distribution	Voucher	Comments
53	2008-12-22 11:32:00	Peter F. Zika	Vascular Plants: Ferns and Lycophytes	Equisetaceae	31988	Equisetaceae		family		N	N	N	N	N	N	N	Native			FNA2: "Equisetum occurs in moist places such as riverbanks, lakeshores, roadsides, ditches, seepage areas, meadows, marshes, and wet woodlands. Aerial stems of Equisetum vary considerably in habit and appearance, even on individual plants, because of environmentally induced modifications affecting height and branching. Many taxonomically trivial varieties and forms have been named. For an extended discussion of this, see R.L. Hauke (1966). Four widespread, named hybrids are treated in the key and fully described below.<br><br>In species descriptions and in the key, length and width are given for the leaf sheath, excluding the free teeth. If the length and width of flattened sheaths are approximately equal and the sides are straight, the sheath is more or less square in face view, i.e., about as long as broad; if the length is greater than the width and the sides are straight, the sheath is more or less elongate in face view, i.e., longer than broad; if the length is greater than the width and the sides are slightly convex, the sheath is elliptic in face view. Stomates are usually visible at 20× magnification.<br><br>Reticulation in Equisetum is summarized in the reticulograms, which show the known and expected hybrids in North America. Most of those in Equisetum subg. Equisetum are still unknown in North America, but they should be sought, especially north of 45Â° N latitude. According to W.J. Cody and D.M. Britton (1989), E . × font-queri occurs rarely in British Columbia and materials possibly representing E . × arcticum Rothmaler have been taken in the Richardson Mountain region of Mackenzie. R.L. Hauke (1978) cited collections of E . × font-queri from British Columbia and California."
54	2018-05-02 22:04:00		Vascular Plants: Ferns and Lycophytes	Equisetaceae	31989	Equisetum		genus		N	N	N	N	N	N	N	Native			
55	2020-04-25 08:15:29		Vascular Plants: Ferns and Lycophytes	Equisetaceae	31992	Equisetum arvense		species		Y	N	N	N	N	N	N	Native	Widely distributed on both sides of the Cascades crest in Washington;	{"Herbarium":"WTU"}	FNA2: "Among the many infraspecific taxa that have been named in this species, Equisetum arvense var. boreale Bongard has been most generally accepted and has been applied to plants with tall, erect stems with 3-ridged branches. Because both 3-ridged and 4-ridged branches may occur on a single stem, the variety boreale is not recognized here as distinct (R.L. Hauke 1966)."
56	2023-09-28 11:50:34		Vascular Plants: Ferns and Lycophytes	Equisetaceae	32000	Equisetum ferrissii		species	named	Y	N	N	N	N	N	N	Native	Occurring chiefly east of the Cascades crest in Washington;	{"Herbarium":"WTU"}	
57	2020-06-04 13:27:05		Vascular Plants: Ferns and Lycophytes	Equisetaceae	32004	Equisetum fluviatile		species		Y	N	N	N	N	N	N	Native	Occurring on both sides of the Cascades crest in Washington;	{"Herbarium":"WTU"}	
58	2023-09-28 12:48:29		Vascular Plants: Ferns and Lycophytes	Equisetaceae	32011	Equisetum hyemale		species		N	N	N	N	N	N	N	Native	Occurring on both sides of the Cascades crest in Washington;	{"Herbarium":"WTU"}	
59	2023-09-28 12:50:44		Vascular Plants: Ferns and Lycophytes	Equisetaceae	32014	Equisetum hyemale ssp. affine		infraspecies		Y	N	N	N	N	N	N	Native	Occurring on both sides of the Cascades crest in Washington;	{"Herbarium":"WTU"}	
60	2023-09-28 17:11:05		Vascular Plants: Ferns and Lycophytes	Equisetaceae	32027	Equisetum laevigatum		species		Y	N	N	N	N	N	N	Native	Occurring chiefly east of the Cascades crest in Washngton;	{"Herbarium":"WTU"}	FNA2: "Schaffner named this species Equisetum kansanum because he applied the name E . laevigatum to what we now know is the hybrid E . × ferrissii . The coarser-stemmed, occasionally persistent forms in the southwestern United States have been called Equisetum funstonii."
61	2008-12-22 11:49:00	Peter F. Zika	Vascular Plants: Ferns and Lycophytes	Equisetaceae	32030	Equisetum litorale		species	Named	Y	N	N	N	N	N	N	Native		{"Herbarium":"WTU"}	FNA2: "Equisetum × litorale is a hybrid between E . arvense and E . fluviatile . It should be expected where the parents coexist. This hybrid has been mistaken for Equisetum palustre ; the solid branches with long first internodes and channeled valleys distinguish it from that species."
62	2008-12-22 11:51:00	Peter F. Zika	Vascular Plants: Ferns and Lycophytes	Equisetaceae	32033	Equisetum mackaii		species	Named	Y	N	N	N	N	N	N	Native		{"Herbarium":"Not at WTU; WS?"}	Reported in WA by Lellinger (1985) but not recorded for WA in FNA.<br><br>FNA2: "The hybrid between Equisetum hyemale and E . variegatum , E . × mackaii , is often mistaken for small forms of E . hyemale."
63	2014-08-29 12:59:00	David Giblin	Vascular Plants: Ferns and Lycophytes	Equisetaceae	32037	Equisetum nelsonii		species	Named	Y	N	N	N	N	N	N	Native		{"Herbarium":"WTU"}	FNA2: "Equisetum × nelsonii , the hybrid between E . laevigatum and E . variegatum , is often mistaken for small forms of E . × ferrissii."
64	2023-09-28 17:17:35		Vascular Plants: Ferns and Lycophytes	Equisetaceae	32039	Equisetum palustre		species		Y	N	N	N	N	N	N	Native	Occurring on both sides of the Cascades crest in Washington;	{"Herbarium":"WTU"}	FNA2: "The name Equisetum palustre var. americanum has been used for specimens from the flora that have longer teeth than those from Eurasia."
66	2023-09-28 17:23:44		Vascular Plants: Ferns and Lycophytes	Equisetaceae	32043	Equisetum scirpoides		species		Y	N	N	N	N	N	N	Native	Occurring east of the Cascades crest in northeastern Washington;	{"Herbarium":"WTU"}	
67	2020-04-27 13:02:20		Vascular Plants: Ferns and Lycophytes	Equisetaceae	32044	Equisetum sylvaticum		species		Y	N	N	N	N	N	N	Native	Occurring east of the Cascades crest in the northeastern counties in Washington;	{"Herbarium":"WTU"}	
68	2021-05-03 14:56:53		Vascular Plants: Ferns and Lycophytes	Equisetaceae	32047	Equisetum telmateia		species		N	N	N	N	N	N	N	Native	Occurring chiefly west of the Cascades crest in Washington;	{"Herbarium":"WTU"}	
69	2023-09-29 20:43:00		Vascular Plants: Ferns and Lycophytes	Equisetaceae	32049	Equisetum telmateia ssp. braunii		infraspecies		Y	N	N	N	N	N	N	Native	Occurring chiefly west of the Cascades crest in Washington;	{"Herbarium":"WTU"}	
70	2023-09-29 20:30:43		Vascular Plants: Ferns and Lycophytes	Equisetaceae	32053	Equisetum variegatum		species		N	N	N	N	N	N	N	Native	Occurring chiefly east of the Cascades crest in Washington;	{"Herbarium":"WTU"}	
72	2023-09-29 20:35:02		Vascular Plants: Ferns and Lycophytes	Equisetaceae	32057	Equisetum variegatum ssp. variegatum		infraspecies		Y	N	N	N	N	N	N	Native	Occurring chiefly east of the Cascades crest in Washington;	{"Herbarium":"WTU"}	
