Salix humilis var. tristis

(Aiton) Griggs

Proc. Ohio Acad. Sci. 4: 301. 1905.

Common names: Dwarf prairie willow
Basionyms: Salix tristis Aiton Hort. Kew. 3: 393. 1789
Synonyms: Salix humilis var. microphylla (Andersson) Fernald
Treatment appears in FNA Volume 7. Treatment on page 130. Mentioned on page 129.

Low to mid shrubs, 0.3–1 m. Stems decumbent; branches tomentose, peeled wood smooth or striate, striae sparse, to 2 mm; branchlets yellowbrown. Leaves: stipules absent or rudimentary on late ones; petiole 0.5–3 (–6) mm, velvety or villous adaxially; largest medial blade narrowly oblong, narrowly elliptic, oblanceolate, or obovate, (13–) 20–50 (–70) × 3–13 mm, 2.3–9 times as long as wide, margins strongly revolute, abaxial surface hairs gray throughout, adaxial slightly glossy, moderately densely tomentose; proximal blade margins entire. Catkins: staminate 6.5–13.5 × 5–10 mm, flowering branchlet 0–1 mm; pistillate 11–17.5 × 5.5–12 mm, flowering branchlet 0–1.5 mm; floral bract 0.8–1.4 mm. Staminate flowers: filaments glabrous or hairy basally. Pistillate flowers: ovary pyriform; ovules 6 per ovary; stigmas 0.2–0.24–0.32 mm. Capsules 5–9 mm.


Phenology: Flowering early Mar-late May.
Habitat: Moist limestone and serpentine barrens, open heath balds, open pine woods, moist prairies, swampy areas in open deciduous woods, stream banks
Elevation: 60-1600 m

Distribution

V7 138-distribution-map.gif

Ark., Conn., Del., D.C., Ga., Ill., Ind., Kans., Ky., La., Maine, Md., Mass., Mich., Minn., Miss., Mo., N.H., N.J., N.Y., N.C., N.Dak., Ohio, Okla., Pa., R.I., S.C., Tenn., Va., W.Va., Wis.

Discussion

Hybrids:

Although variety tristis is reported to hybridize with Salix eriocephala, S. humilis var. humilis, and S. petiolaris (G. W. Argus 1986), hybrids have not been confirmed.

Selected References

None.

Lower Taxa

None.

"-0.32mm" is not declared as a valid unit of measurement for this property.

21 +, 4 +, 1 +, 16 +  and 29 +
114 +, 95 +, 76 +, 57 +  and 38 +
glaucous +  and sparsely densely tomentose or woolly +
square +  and oblong +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
pilose;tomentose;pilose;tomentose;pubescent;glabrous +
purple turning yellow +
cylindrical +  and ellipsoid +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
Acute (?) +, Rounded (?) +, Convex (?) +  and Acuminate (?) +
George W. Argus +
(Aiton) Griggs +
convex +  and cuneate +
Salix tristis +
tapering +
ferruginous +  and white +
densely tomentose +  and glabrescent +
toothed +  and 2-fid +
persistent +
dark redbrown +
flowered +  and pistillate +
0.9 cm9 mm <br />0.009 m <br /> (4.7 cm47 mm <br />0.047 m <br />) +
velvety-tomentose +  and glabrescent +
globose +  and subglobose +
slender +  and stout +
0 cm0 mm <br />0 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
0.55 cm5.5 mm <br />0.0055 m <br /> (1.9 cm19 mm <br />0.019 m <br />) +
intermediate +
0.5 cm5 mm <br />0.005 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
pistillate +  and staminate +
1.1 cm11 mm <br />0.011 m <br /> (1.75 cm17.5 mm <br />0.0175 m <br />) +
pendulous +, spreading +  and erect +
0.55 cm5.5 mm <br />0.0055 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
Dwarf prairie willow +
Ark. +, Conn. +, Del. +, D.C. +, Ga. +, Ill. +, Ind. +, Kans. +, Ky. +, La. +, Maine +, Md. +, Mass. +, Mich. +, Minn. +, Miss. +, Mo. +, N.H. +, N.J. +, N.Y. +, N.C. +, N.Dak. +, Ohio +, Okla. +, Pa. +, R.I. +, S.C. +, Tenn. +, Va. +, W.Va. +  and Wis. +
60-1600 m +
hairy +  and glabrous +
bicolor +, black +  and brown +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.14 cm1.4 mm <br />0.0014 m <br />) +
pistillate +  and staminate +
bisexual +  and unisexual +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.04 cm0.4 mm <br />4.0e-4 m <br />) +
Moist limestone and serpentine barrens, open heath balds, open pine woods, moist prairies, swampy areas in open deciduous woods, stream banks +
ferruginous +  and white +
straight +
spreading +  and erect +
unbranched +  and spicate +
subterminal +  and axillary +
membranaceous +
hemiamphistomatous +, amphistomatous +  and hypostomatous +
5 cm50 mm <br />0.05 m <br /> (7 cm70 mm <br />0.07 m <br />) +
2 cm20 mm <br />0.02 m <br /> (5 cm50 mm <br />0.05 m <br />) +
obovate +, oblanceolate +, elliptic +  and oblong +
0.3 cm3 mm <br />0.003 m <br /> (1.3 cm13 mm <br />0.013 m <br />) +
arranged +  and alternate +
9 cm90 mm <br />0.09 m <br /> (13.5 cm135 mm <br />0.135 m <br />) +
2.3 cm23 mm <br />0.023 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
marcescent +
deciduous +
20mm;90mm +
obovate +, oblanceolate +, elliptic +  and oblong +
0.3 cm3 mm <br />0.003 m <br /> (2.3 cm23 mm <br />0.023 m <br />) +
sinuate +, crenate +, entire +, flat +  and revolute +
2-7[-10]-carpellate +
short-silky-villous +
pyriform +
0.3 cm3 mm <br />0.003 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
glandular-dotted +
villous +  and velvety +
convex;flat +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Flowering early Mar-late May. +
Proc. Ohio Acad. Sci. +
overlapping +
distinct +
Weedy +, Illustrated +  and Endemic +
decumbent;erect +
non-papillate +
cylindrical +
0.1 cm1 mm <br />0.001 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
caducous +  and persistent +
0 cm0 mm <br />0 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
distinct +  and connate +
persistent +  and deciduous +
Salix humilis var. microphylla +
Salix humilis var. tristis +
Salix humilis +
variety +
pointed +  and rounded +
sympodial +, branching +  and heterophyllous +
striate +  and smooth +