Purshia stansburyana

(Torrey) Henrickson

Phytologia 60: 468. 1986.

Common names: Cliffrose
Basionym: Cowania stansburyana Torrey in H. Stansbury, Exped. Great Salt Lake, 386, plate 3. 1852 (as stansburiana)
Synonyms: C. mexicana var. stansburyana (Torrey) Jepson Purshia mexicana var. stansburyana (Torrey) S. L. Welsh
Treatment appears in FNA Volume 9. Treatment on page 341. Mentioned on page 339, 342.

Shrubs, evergreen, 10–40 (–75) dm. Stems: young-stem internodes 5–14 mm, sparsely hirtellous or glabrous, usually stipitate-glandular; short-shoot spurs simple or branched, 10–20 (–40) × 1.2–2.7 mm. Leaves: blade dark green adaxially, obovate, (3–) 7–12 (–19) × (2–) 3–8 (–13) mm, irregularly lobed in distal 1/2, lobes (3–) 5 (–7), proximal 2 lobes ascending, oblong to spatulate, narrow, 2–6 mm, distal 3 lobes deflexed, reduced, margins strongly revolute, usually entire, rarely toothed proximally, apex rounded to truncate, abaxial surface white-villous, midvein greenish, glabrate, glandular-punctate, adaxial sparsely hirtellous or arachnoid villous, soon glabrate, ± glandular-punctate. Pedicels 2.5–4.5 mm. Flowers: hypanthium obconic, 4–6.5 × 1.5–3 mm, 3–5 mm diam. in fruit, arachnoid-villous to pubescent, usually stipitate-glandular; petals light to cream-yellow or white, broadly obovate, 7–13 (–15) mm; stamens (52–) 60–90 (–125); carpels (3–) 4–7 (–10). Achenes oblanceoloid, 6–8 × 1.8–2.2 mm, 12-ribbed, persistent style 35–59 mm, plumose hairs 1.4–2.2 mm. 2n = 18.


Phenology: Flowering Apr–May(–Oct).
Habitat: Pinyon-juniper, Joshua tree, yellow pine woodlands, arid desert scrub, desert chaparral
Elevation: (1000–)1200–2200(–2600 m)

Distribution

V9 560-distribution-map.jpg

Ariz., Calif., Colo., Idaho, Nev., N.Mex., Utah, Mexico (Baja California), Mexico (Sonora)

Discussion

Purshia stansburyana is vegetatively similar to P. tridentata var. glandulosa, the latter usually having thicker leaves with narrower abaxial grooves and apiculate apices. The two sometimes can only be distinguished by flowers or fruits.

Purshia stansburyana forms hybrids with P. tridentata vars. glandulosa and tridentata. The hybrids easily can be recognized by their 2–3(–5) carpels and achenes with styles 12–28 mm, among other characteristics (H. C. Stutz and L. K. Thomas 1963). Hybrids between P. stansburyana and P. tridentata var. glandulosa have been given the names Cowania mexicana var. dubia Brandegee and C. alba Goodding. Introgression with P. stansburyana occurs in two populations of P. subintegra.

Selected References

None.

Lower Taxa

None.
... more about "Purshia stansburyana"
0.6 cm6 mm <br />0.006 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
oblanceoloid +
1.8mm +  and 2.2mm +
glabrate +, villous +, arachnoid +  and hirtellous +
hairy +  and glabrous +
James Henrickson +
(Torrey) Henrickson +
gray +  and cinnamon brown +
weathering +
compound +  and simple +
opposite +  and alternate +
cuneate +  and clawed +
Cowania stansburyana +
1.2 cm12 mm <br />0.012 m <br /> (1.9 cm19 mm <br />0.019 m <br />) +
1.5 cm15 mm <br />0.015 m <br /> (1.9 cm19 mm <br />0.019 m <br />) +
0.8 cm8 mm <br />0.008 m <br /> (1.3 cm13 mm <br />0.013 m <br />) +
0.7 cm7 mm <br />0.007 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
lobed +  and obovate +
0.3 cm3 mm <br />0.003 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
3mm +  and 8mm +
free +  and distinct +
Cliffrose +
Ariz. +, Calif. +, Colo. +, Idaho +, Nev. +, N.Mex. +, Utah +, Mexico (Baja California) +  and Mexico (Sonora) +
not +  and aggregated +
(1000–)1200–2200(–2600 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 />) +
Pinyon-juniper, Joshua tree, yellow pine woodlands, arid desert scrub, desert chaparral +
plumose +
0.14 cm1.4 mm <br />0.0014 m <br /> (0.22 cm2.2 mm <br />0.0022 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
stipitate-glandular +, arachnoid-villous +  and pubescent +
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 +
deflexed +  and ascending +
oblong +  and spatulate +
reduced +
2mm +  and 6mm +
inferior +  and superior +
clustered +, biseriate +  and superposed +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
0 (?) +  and 4 (?) +
1.3 cm13 mm <br />0.013 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
free +  and distinct +
0.7 cm7 mm <br />0.007 m <br /> (1.3 cm13 mm <br />0.013 m <br />) +
Flowering Apr–May(–Oct). +
adnate +, free +, connate +  and distinct +
not arillate +
persistent +
free +  and distinct +
spreading-reflexing +  and spreading-reflexed +
ovate +  and oblong-ovate +
branched +  and simple +
2 cm20 mm <br />0.02 m <br /> (4 cm40 mm <br />0.04 m <br />) +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.27 cm2.7 mm <br />0.0027 m <br />) +
free +  and distinct +
3 +  and 20 +
adnate +  and free +
persistent +
distinct +
basal +, lateral +, subterminal +  and terminal +
elongate +
3.5 cm35 mm <br />0.035 m <br /> (5.9 cm59 mm <br />0.059 m <br />) +
C. mexicana var. stansburyana +  and Purshia mexicana var. stansburyana +
Purshia stansburyana +
species +
inconspicuous +
hemispheric +
stipitate-glandular +, glabrous +  and hirtellous +
0.5 cm5 mm <br />0.005 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +