Checklist » Salicaceae » Salix exigua var. exigua
Last updated 4/3/2010 by David Giblin.
Salix exigua Nutt. var. exigua[FNA7, HC, HC2]
coyote willow, narrow-leaf willow

Publication: N. Amer. Sylv. 1: 75. 1842.

Origin: Native

selected vouchers: WTU

Notes: FNA7: "Variety exigua forms natural hybrids with var. hindsiana, Salix columbiana, S. interior, and S. melanopsis.

Variety exigua × var. hindsiana was reported by R. D. Dorn (1998). Inasmuch as the two varieties are subtly distinct, hybrids are difficult to recognize.

Variety exigua × Salix interior probably occurs throughout their area of overlap; it is known to me from Alberta and Nebraska, where there are plants with leaves indistinctly toothed and more silky than in S. interior. R. D. Dorn (1998) reported it from Alberta, British Columbia, Colorado, Montana, Nebraska, New Mexico, Oklahoma, South Dakota, Texas, and Wyoming.

Variety exigua × Salix melanopsis is intermediate, with juvenile leaves densely hairy proximally, truncate floral bracts, and prominent stipules (R. D. Dorn 1998)."

References: (none)

Synonyms & Misapplied Names:
Salix argophylla Nutt.
Salix exigua Nutt. ssp. exigua[HC]
Salix exigua Nutt. var. luteosericea (Rydb.) C.K. Schneid.
Salix exigua Nutt. var. nevadensis (S. Watson) C.K. Schneid.
Salix exigua Nutt. var. stenophylla (Rydb.) C.K. Schneid.[HC]
Salix exigua Nutt. var. virens Rowlee
Salix fluviatilis Nutt. var. argophylla (Nutt.) Sarg.
Salix interior Rowlee var. luteosericea (Rydb.) C.K. Schneid.
Salix longifolia Muhl. var. argophylla (Nutt.) Andersson
Salix longifolia Lam. var. exigua (Nutt.) Bebb
Salix longifolia Muhl. var. opaca Andersson
Salix luteosericea Rydb.
Salix malacophylla Nutt. ex C.R. Ball
Salix nevadensis S. Watson
Salix stenophylla Rydb.