Malacothamnus clementinus

(Munz & I. M. Johnston) Kearney

Leafl. W. Bot. 6: 127. 1951.

Common names: San Clemente Island bushmallow
Conservation concernEndemic
Basionym: Malvastrum clementinum Munz & I. M. Johnston Bull. Torrey Bot. Club 51: 296. 1924
Synonyms: Sphaeralcea orbiculata var. clementina (Munz & I. M. Johnston) Jepson
Treatment appears in FNA Volume 6. Treatment on page 283. Mentioned on page 281.

Subshrubs, 0.4–1 m, branches slender, indument white or grayish, sparse to dense, shaggy-tomentose, canescent, hairs mostly stellate, stalked, 10–30-armed. Leaf-blades ± round, 3-lobed or 5-lobed, to 5 (–8) cm, thin to moderately thick, surfaces: adaxial dark green and glabrate, abaxial soft-tomentose, lobes triangular to rounded, basal sinus not overlapping. Inflorescences short-spicate, flower clusters subsessile, congested; involucellar bractlets filiform to linear, 3–9 × 0.5 mm, 3/4 to exceeding calyx length. Flowers: calyx campanulate, 5–9 mm, lobes coherent, narrowly triangular, 3.5–6.5 × 1.5–2.3 mm, ca. 2 times as long as wide, 2–3 times tube length, apex long-acute to acuminate, densely villous; petals white, fading lavender, 1.5 cm. Mericarps 2–3 mm. 2n = 34.


Phenology: Flowering Mar–May.
Habitat: Coastal sage scrub
Elevation: 100–400 m

Discussion

Of conservation concern.

Malacothamnus clementinus is known from San Clemente Island and is considered endangered. In leaf characters it is similar to M. fasciculatus; in indument and calyx characters, it approaches M. fremontii. The petals are often not overlapping, a feature rare in Malacothamnus. Malacothamnus clementinus tends to propagate mainly via rhizomes and rarely produces fertile seeds.

Malacothamnus clementinus is in the Center for Plant Conservation’s National Collection of Endangered Plants.

Selected References

None.

Lower Taxa

None.

No values specified.

... more about "Malacothamnus clementinus"
loculicidal +
David M. Bates +
(Munz & I. M. Johnston) Kearney +
not overlapping +
cordate +  and truncate or cuneate +
Malvastrum clementinum +
5 cm50 mm <br />0.05 m <br /> (8 cm80 mm <br />0.08 m <br />) +
0 cm0 mm <br />0 m <br /> (5 cm50 mm <br />0.05 m <br />) +
5-lobed;3-lobed;round +
thin +  and moderately thick +
ovate +  and round rhombic or reniform unlobed or palmately 3-lobed 5-lobed or 7-lobed +
0.3 cm3 mm <br />0.003 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
filiform +  and linear +
0.5 cm5 mm <br />0.005 m <br /> (?) +
slender +
campanulate +
not accrescent +
0.5 cm5 mm <br />0.005 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
indehiscent +  and loculicidal +
San Clemente Island bushmallow +
white +, usually rose +  and pale-pink pinkish mauve or mauve +
100–400 m +
sparse;copious +
subterminal +
unisexual +  and bisexual +
subglobose-obovate +, disclike +  and not inflated +
Coastal sage scrub +
10-30-armed +  and stalked +
bifurcate +
tough-fibrous +
connate +  and distinct +
simple +, stipulate +, sessile +, subsessile +  and petiolate +
distichous +  and alternate +
coherent +
triangular +  and rounded +
1.5mm;2.3mm +
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 +
1.5 cm15 mm <br />0.015 m <br /> (?) +
Flowering Mar–May. +
Leafl. W. Bot. +
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 orbiculata var. clementina +
Malacothamnus clementinus +
Malacothamnus +
species +
glabrate +  and densely hairy +
monoecious +, dioecious +  and hermaphroditic +