Coleogyne ramosissima

Torrey

Smithsonian Contr. Knowl. 6(2)[as 5(1)]: 8, plate 4. 1853.

EndemicIllustrated
Treatment appears in FNA Volume 9. Treatment on page 391.

Stems strigose, medifixed hairs to 0.5 mm; internodes 1–2 cm, short-shoot spurs to 7 mm, 1 mm thick. Leaves: 0.4–1 (–1.2) mm, base clasping; stipules acute, free portion 0.2–0.5 mm; blade 3-angled in cross-section, 0.6–1.4 mm wide, abaxially 5-ribbed, apex acute, surfaces strigose. Flowers: sepals ovate to broadly ovate or obovate, concave-convex, 5–7 mm, outer pair acuminate, inner cuspidate, abaxially red-green, strigose, adaxially yellow to orange-yellow, glabrous; petals, if present, 5–8 mm; stamens borne between sepals and on proximal 1/2 of torus sheath, filaments yellow, 5–8 mm; torus sheath light yellow, tubular, narrowly obconic, 4–6 (–9) mm, thick-membranous, exterior glabrous, interior long-sericeous proximally, hair tips slightly protruding from orifice of sheath; styles 5–6 mm, slender, stigmas 3–5 mm. Achenes redbrown. 2n = 16.


Phenology: Flowering Apr–May; fruiting Jun–Oct.
Habitat: Arid scrub zones, Great Basin and Mojave deserts, pinyon-juniper, Joshua tree woodlands
Elevation: (300–)900–1800(–2400) m

Distribution

V9 653-distribution-map.jpg

Ariz., Calif., Colo., Nev.

Discussion

In the Great Basin and Mojave deserts, Coleogyne ramosissima is the dominant shrub in areas of shallow soils underlain by a caliche layer (S. A. Lei and L. R. Walker 1997). In deeper soils, grasses and other shrubs prevent dominance by C. ramosissima. The species has a notably long life span; seedling establishment is rare in arid sites but is more likely at higher elevations and in cooler portions of the species's range (R. H. Webb et al. 1987; S. E. Meyer and B. K. Pendleton 2005).

In some areas Coleogyne ramosissima provides important cover and winter browse for mule deer and desert bighorn sheep (D. L. Jeffries and J. M. Klopatek 1987). It is used to a much lesser extent by domestic livestock. B. K. Pendleton and R. L. Pendleton (1998) show the species is wind pollinated.

Selected References

None.

Lower Taxa

None.
... more about "Coleogyne ramosissima"
James Henrickson +  and Bruce D. Parfitt† +
Torrey +
gray +  and dark russet +
compound +  and simple +
opposite +  and alternate +
3-angled +
0.6 cm6 mm <br />0.006 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
0.6mm +  and 1.4mm +
reduced +
free +  and distinct +
Ariz. +, Calif. +, Colo. +  and Nev. +
not +  and aggregated +
(300–)900–1800(–2400) m +
long-sericeous +  and glabrous +
0.5 cm5 mm <br />0.005 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
1.1 cm11 mm <br />0.011 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
unisexual +  and bisexual +
0.5 cm5 mm <br />0.005 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
not +  and aggregated +
not +  and aggregated +
ovoid-reniform +
0.53 cm5.3 mm <br />0.0053 m <br /> (0.58 cm5.8 mm <br />0.0058 m <br />) +
not +  and aggregated +
Arid scrub zones, Great Basin and Mojave deserts, pinyon-juniper, Joshua tree woodlands +
medifixed +
0 cm0 mm <br />0 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
crassinucellate +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
opposite +  and alternate +
0.1 cm1 mm <br />0.001 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
persistent +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
thin +  and thick +
inferior +  and superior +
biseriate +  and clustered +
0 (?) +  and 4 (?) +
free +  and distinct +
1 +  and 4 +
Flowering Apr–May +  and fruiting Jun–Oct. +
adnate +, free +, connate +  and distinct +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
Smithsonian Contr. Knowl. +
not arillate +
adaxially yellow +  and orange-yellow +
persistent +
free +  and distinct +
ascending +  and spreading +
inner +  and outer +
glabrous +  and strigose +
acuminate +, concave-convex +, ovate +  and broadly ovate or obovate +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
tubelike +
0 cm0 mm <br />0 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
Endemic +  and Illustrated +
free +  and distinct +
branched +  and simple +
15 +  and 150 +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
persistent +
distinct +
sericeous +
not elongate +
slender +
0.5 cm5 mm <br />0.005 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
Coleogyne ramosissima +
Coleogyne +
species +
inconspicuous +
0.6 cm6 mm <br />0.006 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
obconic +  and tubular +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
thick-membranous +