Purshia ericifolia

(Torrey ex A. Gray) Henrickson

Phytologia 60: 468. 1986.

Basionym: Cowania ericifolia Torrey ex A. Gray Smithsonian Contr. Knowl. 5(6): 106. 1853
Treatment appears in FNA Volume 9. Treatment on page 342. Mentioned on page 340.

Shrubs, evergreen, 5–15 (–25) dm. Stems: young-stem internodes 2–9 mm, closely white villous-tomentose, ± glabrate, eglandular; short-shoot spurs simple or branched, 5–20 × 1.5–2 mm. Leaves: blade dark green adaxially, linear-subulate, (2.5–) 3–8 (–10) × 0.7–1 (–1.5) mm, margins strongly revolute (nearly obscuring abaxial surfaces), entire, apex acuminate to cuspidate, abaxial surface sparsely arachnoid-villous abaxial groove 0.1–0.3 mm wide, broader at base, densely villous, adaxial glabrate, eglandular. Pedicels 2–13 (–20) mm. Flowers: hypanthium hemispheric, 2.5–4 × 2–3 mm, to 5.5 mm diam. in fruit, closely villous, sometimes stipitate-glandular; petals white or suffused with red, broadly obovate, 4–8 (–11) mm; stamens (60–) 80–120; carpels (12–) 17–31. Achenes oblanceoloid, 4–6 × 1.1–1.3 mm, weakly 2–3 ribbed, persistent style 15–30 mm, plumose hairs 1–2 mm. 2n = 18.


Phenology: Flowering Jun–Sep.
Habitat: Arid rocky limestone slopes, cliffs, Chihuahuan Desert
Elevation: (600–)800–1600(–2100) m

Distribution

V9 562-distribution-map.jpg

Tex., Mexico (Chihuahua), Mexico (Coahuila)

Discussion

Purshia ericifolia is known from Brewster and Presidio counties in trans-Pecos Texas. The species is distinctive in its subterete, arcuate leaves that are distichous in gradual spirals on short shoots. It flowers after rain.

Selected References

None.

Lower Taxa

None.

No values specified.

... more about "Purshia ericifolia"
villous +  and arachnoid-villous +
pubescent-villous +  and hairy +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
oblanceoloid +
1.1mm +  and 1.3mm +
hairy +  and glabrous +
James Henrickson +
(Torrey ex A. Gray) Henrickson +
gray +  and cinnamon brown +
weathering +
compound +  and simple +
opposite +  and alternate +
cuneate +  and clawed +
Cowania ericifolia +
0.8 cm8 mm <br />0.008 m <br /> (1 cm10 mm <br />0.01 m <br />) +
1.5 cm15 mm <br />0.015 m <br /> (1.9 cm19 mm <br />0.019 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
linear-subulate +
0.3 cm3 mm <br />0.003 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
0.7mm +  and 1mm +
free +  and distinct +
Tex. +, Mexico (Chihuahua) +  and Mexico (Coahuila) +
not +  and aggregated +
(600–)800–1600(–2100) m +
nectariferous +
glabrous +, not +, stipitate-glandular +  and villous +
1 cm10 mm <br />0.01 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
unisexual +  and bisexual +
not +  and aggregated +
oblanceoloid +  and obovoid-fusiform +
0.4 cm4 mm <br />0.004 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
Arid rocky limestone slopes, cliffs, Chihuahuan Desert +
plumose +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
0 cm0 mm <br />0 m <br /> (0.55 cm5.5 mm <br />0.0055 m <br />) +
stipitate-glandular +  and villous +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.65 cm6.5 mm <br />0.0065 m <br />) +
crassinucellate +
drought-deciduous +  and persistent +
immature +  and abscising +
toothed +  and lobed +
inferior +  and superior +
clustered +, biseriate +  and superposed +
1.3 cm13 mm <br />0.013 m <br /> (2 cm20 mm <br />0.02 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (1.3 cm13 mm <br />0.013 m <br />) +
0 (?) +  and 4 (?) +
0.8 cm8 mm <br />0.008 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
free +  and distinct +
0.4 cm4 mm <br />0.004 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
Flowering Jun–Sep. +
adnate +, free +, connate +  and distinct +
not arillate +
persistent +
free +  and distinct +
spreading-reflexing +  and spreading-reflexed +
ovate +  and oblong-ovate +
branched +  and simple +
0.5 cm5 mm <br />0.005 m <br /> (2 cm20 mm <br />0.02 m <br />) +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
free +  and distinct +
3 +  and 20 +
adnate +  and free +
persistent +
distinct +
basal +, lateral +, subterminal +  and terminal +
elongate +
1.5 cm15 mm <br />0.015 m <br /> (3 cm30 mm <br />0.03 m <br />) +
Cowania +
Purshia ericifolia +
species +
inconspicuous +
hemispheric +
glabrate +  and villous-tomentose +
0.2 cm2 mm <br />0.002 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +