Salix taxifolia

Kunth in A. von Humboldt et al.

in A. von Humboldt et al., Nov. Gen. Sp. 2(qto.): 22.

,

2(fol.): 18. 1817.

Common names: Yew-leaf willow
Synonyms: Salix exilifolia Dorn Salix taxifolia var. lejocarpa Andersson Salix taxifolia var. limitanea I. M. Johnston Salix taxifolia var. sericocarpa Andersson
Treatment appears in FNA Volume 7. Treatment on page 54. Mentioned on page 52, 53, 60.

Shrubs or trees, 2–16 m. Stems: branches redbrown, yellowbrown, or gray-brown, hairy or glabrous; branchlets yellowbrown, very densely long-silky, villous, or short-silky to glabrescent. Leaves: stipules absent or rudimentary; petiole (sometimes deeply grooved adaxially) 0.2–1.5 mm, long to short-silky adaxially; largest medial blade linear, lorate, or narrowly oblanceolate, 13–42 × 1.1–4.4 mm, 5.8–24.6 times as long as wide, base cuneate, margins flat, usually entire, rarely remotely spinulose-serrulate, apex acute to acuminate (apiculate), abaxial surface glaucous or not (sometimes obscured by hairs), densely long-silky, or villous to glabrescent, hairs appressed, straight, adaxial slightly glossy or dull, moderately densely long or short-silky to glabrescent; proximal blade margins entire; juvenile blade yellowish green (color obscured by hairs), very densely long-silky abaxially. Catkins: staminate 6.5–18 × 4–7 mm, flowering branchlet 1–38 (–75) mm; pistillate moderately densely or loosely flowered, slender or stout, 6–16 × 4–7 mm, flowering branchlet 8–13 (–120) mm; floral bract 1.3–2.8 mm, apex acute or convex, toothed or entire (glandular-dotted), abaxially hairy throughout or proximally, hairs straight. Staminate flowers: abaxial nectary 0.1–0.6 mm, adaxial nectary oblong or narrowly oblong, 0.5–1.1 mm, nectaries distinct; filaments hairy on proximal 1/2 or basally; anthers 0.4–0.7 mm. Pistillate flowers: adaxial nectary square, narrowly oblong, ovate, or oblong, 0.4–1.4 mm, longer than stipe; stipe 0–0.3 mm; ovary pyriform, long-silky or pilose, beak gradually tapering to or bulged below styles; ovules 16–26 per ovary; styles 0–0.3 mm; stigmas slenderly cylindrical, 0.4–0.6 mm. Capsules 3–6 mm.


Phenology: Flowering throughout year, mostly early Mar-late Jun.
Habitat: Silty to sandy floodplains, gravelly arroyos, dry washes
Elevation: 400-2000 m

Distribution

V7 45-distribution-map.gif

Ariz., N.Mex., Tex., Mexico (Baja California), Mexico (Baja California Sur), Mexico (Chiapas), Mexico (Chihuahua), Mexico (Coahuila), Mexico (Sonora)

Discussion

The name Salix taxifolia is used here in the sense of G. W. Argus and C. L. McJannet (1992). R. D. Dorn (1998) used that name instead for what Argus and McJannet called S. microphylla, and for the present species used S. exilifolia. Dorn did not cite specimens of S. exilifolia, but Texas plants, possibly annotated by him, were mapped by B. L. Turner et al. (2003). The distribution of S. taxifolia parallels that of S. thurberi Rowlee, recognized here and by Dorn as a distinct species.

Selected References

None.

Lower Taxa

None.

... more about "Salix taxifolia"
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
villous +  and glabrescent +
oblong +, ovate +  and square +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.14 cm1.4 mm <br />0.0014 m <br />) +
short-silky to glabrescent +  and long +
dull +  and glossy +
reddish turning yellow +  and yellow +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.07 cm0.7 mm <br />7.0e-4 m <br />) +
Entire (?) +, Toothed (?) +, Convex (?) +, Acute (?) +  and Acuminate (?) +
George W. Argus +
Kunth in A. von Humboldt et al. +
cuneate +
Longifoliae +
tapering +
yellowish green +
toothed +  and 2-fid +
deciduous +
gray-brown +, yellowbrown +  and redbrown +
glabrous +  and hairy +
1.3 cm13 mm <br />0.013 m <br /> (12 cm120 mm <br />0.12 m <br />) +
short-silky +  and glabrescent +
stout +  and slender +
0.8 cm8 mm <br />0.008 m <br /> (1.3 cm13 mm <br />0.013 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
flowered +, pistillate +  and staminate +
0.6 cm6 mm <br />0.006 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
pendulous +, spreading +  and erect +
stout +  and slender +
0.4 cm4 mm <br />0.004 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
Yew-leaf willow +
Ariz. +, N.Mex. +, Tex. +, Mexico (Baja California) +, Mexico (Baja California Sur) +, Mexico (Chiapas) +, Mexico (Chihuahua) +, Mexico (Coahuila) +  and Mexico (Sonora) +
400-2000 m +
0.13 cm1.3 mm <br />0.0013 m <br /> (0.28 cm2.8 mm <br />0.0028 m <br />) +
pistillate +  and staminate +
bisexual +  and unisexual +
Silty to sandy floodplains, gravelly arroyos, dry washes +
straight +
unbranched +  and spicate +
subterminal +  and axillary +
membranaceous +
hypostomatous +  and amphistomatous +
1.3 cm13 mm <br />0.013 m <br /> (4.2 cm42 mm <br />0.042 m <br />) +
oblanceolate +, lorate +  and linear +
0.11 cm1.1 mm <br />0.0011 m <br /> (0.44 cm4.4 mm <br />0.0044 m <br />) +
arranged +  and alternate +
marcescent +
deciduous +
spinulose-serrulate +  and entire +
2-7[-10]-carpellate +
pilose +  and long-silky +
pyriform +
glandular-dotted +
flat;convex +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
Flowering throughout year, mostly early Mar-late Jun. +
in A. von Humboldt et al., Nov. Gen. Sp. +
overlapping +
distinct +
branched +, sympodial +, monopodial +  and branching +
non-papillate +
cylindrical +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
0 cm0 mm <br />0 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
caducous +  and persistent +
distinct +  and connate +
0 cm0 mm <br />0 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
persistent +  and deciduous +
Salix exilifolia +, Salix taxifolia var. lejocarpa +, Salix taxifolia var. limitanea +  and Salix taxifolia var. sericocarpa +
Salix taxifolia +
Salix subg. Longifoliae +
species +
rounded +
sympodial +, branching +  and heterophyllous +
tree +  and shrub +