Malacothamnus davidsonii

(B. L. Robinson) Greene

Leafl. Bot. Observ. Crit. 1: 208. 1906.

Common names: Davidson’s bushmallow
Conservation concernEndemic
Basionym: Malvastrum davidsonii B. L. Robinson in A. Gray et al., Syn. Fl. N. Amer. 1(1,2): 312. 1897
Synonyms: Sphaeralcea davidsonii (B. L. Robinson) Jepson
Treatment appears in FNA Volume 6. Treatment on page 282. Mentioned on page 281, 283.

Shrubs, to 3 (–5) m, branches usually stout, indument white to tawny, dense (shaggy-tomentose), stellate hairs sessile or stalked, 10–30-armed, arms 0.2–1.5 mm. Leaf-blades ± round, 3-lobed, 5-lobed, or 7-lobed, 5–11 (–20) cm, thick, surfaces: adaxial tawny and densely stellate-hairy (velvety to scabrous-tomentose), basal lobes overlapping. Inflorescences spicate to racemose, flower clusters usually short-pedunculate, glomerate; involucellar bractlets subulate, 1.5–4 × to 1 mm, usually less than 1/2 calyx length. Flowers: calyx campanulate, 5–9 mm, lobes triangular to ovate, 3–5 × 1.8–3.2 (–4) mm, slightly longer than wide, slightly longer than tube, apex acute to short-mucronate, densely stellate-hairy, hairs 10–30-armed; petals mauve, to 1.5 cm. Mericarps 2–3 mm. 2n = 34.


Phenology: Flowering Jun–Aug.
Habitat: Slopes, washes, chaparral
Elevation: 200–700 m

Discussion

Malacothamnus davidsonii occurs on the central Coast Ranges of San Luis Obispo and Monterey counties and Transverse Ranges in Los Angeles County. It intergrades with M. fasciculatus in Little Tujunga and Pacoima canyons in Los Angeles County.

Of conservation concern.

Selected References

None.

Lower Taxa

None.
... more about "Malacothamnus davidsonii"
loculicidal +
stellate-hairy +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
David M. Bates +
(B. L. Robinson) Greene +
cordate +  and truncate or cuneate +
Malvastrum davidsonii +
11 cm110 mm <br />0.11 m <br /> (20 cm200 mm <br />0.2 m <br />) +
5 cm50 mm <br />0.05 m <br /> (11 cm110 mm <br />0.11 m <br />) +
7-lobed;5-lobed;7-lobed;5-lobed;3-lobed;round +
ovate +  and round rhombic or reniform unlobed or palmately 3-lobed 5-lobed or 7-lobed +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
0 cm0 mm <br />0 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
campanulate +
not accrescent +
0.5 cm5 mm <br />0.005 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
indehiscent +  and loculicidal +
Davidson’s bushmallow +
white +, usually rose +  and pale-pink pinkish mauve or mauve +
200–700 m +
sparse;copious +
subterminal +
glomerate +  and short-pedunculate +
unisexual +  and bisexual +
subglobose-obovate +, disclike +  and not inflated +
Slopes, washes, chaparral +
10-30-armed +, stalked +  and sessile +
bifurcate +
tough-fibrous +
connate +  and distinct +
simple +, stipulate +, sessile +, subsessile +  and petiolate +
distichous +  and alternate +
0.32 cm3.2 mm <br />0.0032 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
slightly longer +  and slightly longer than wide +
triangular +  and ovate +
1.8mm;3.2mm +
entire +  and serrate +
smooth-walled +  and 1-celled +
asymmetrically suborbicular +  and obovoid-reniform +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
7-14-carpellate +
adnate +  and distinct +
0 cm0 mm <br />0 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
Flowering Jun–Aug. +
Leafl. Bot. Observ. Crit. +
minutely stellate-hairy or rarely glabrous +  and papillate-stellate +
Black (?) +  and Brown (?) +
hairy +  and glabrous +
obovoid-reniform +
persistent +
Conservation concern +  and Endemic +
sessile +  and subsessile +
ascending;erect +
filiform +, linear +  and capitate +
1-2 times number of carpels +
? (?) +  and ? (?) +
7-14-branched +
Sphaeralcea davidsonii +
Malacothamnus davidsonii +
Malacothamnus +
species +
glabrate +  and densely hairy +
monoecious +, dioecious +  and hermaphroditic +