Malacothamnus jonesii

(Munz) Kearney

Leafl. W. Bot. 6: 135. 1951.

Common names: San Luis Obispo or Jones’s bushmallow
Endemic
Basionym: Malvastrum jonesii Munz Bull. S. Calif. Acad. Sci. 24: 88. 1925
Synonyms: Malacothamnus gracilis (Eastwood) Kearney M. niveus (Eastwood) Kearney Malvastrum fremontii var. niveum (Eastwood) McMinn M. gracile Eastwood M. niveum Eastwood
Treatment appears in FNA Volume 6. Treatment on page 284. Mentioned on page 282.

Shrubs, 1–2.5 m, branches slender, flexuous, indument white, usually velvety, not shaggy, stellate hairs stalked, sometimes sublepidote, ca. 10–30-armed, glandular-hairs often abundant. Leaf-blades ash green, ovate, ± rhombic, or suborbiculate, unlobed or 3-lobed or 5-lobed, 2.5–4.5 (–7) cm, thin to thick, surfaces: soft tomentose-white, adaxial pale ash green, white-velvety, basal sinus open, not overlapping. Inflorescences open-paniculate or subracemose, flower clusters pedunculate, loose, 3 (–6) -flowered, or solitary flowers; involucellar bractlets awl-shaped to filiform, 2.5–7 (–8) × 1 mm, 1/3–1/2 (–2/3) calyx length. Flowers: calyx campanulate, not angled in bud, 5–9 (–10) mm, lobes distinct in bud, narrowly triangular or deltate-lanceolate, 3–6 (–7.5) × 1.5–3 (–4) mm, length 2 times width, equaling to 3 times tube length, apex acute to short-acuminate, usually sublepidote to tomentose, hairs 10–30-armed, sometimes densely lanate; petals pale-pink, to 1 cm. Mericarps 2.5–3.8 mm. 2n = 34.


Phenology: Flowering late Apr–Jun.
Habitat: Open chaparral, foothill woodlands
Elevation: 200–900 m

Discussion

Malacothamnus jonesii is known from the central Coast Ranges.

Selected References

None.

Lower Taxa

None.
... more about "Malacothamnus jonesii"
green +  and pale ash +
loculicidal +
acute;short-acuminate +
David M. Bates +
(Munz) Kearney +
not overlapping +
cordate +  and truncate or cuneate +
Malvastrum jonesii +
4.5 cm45 mm <br />0.045 m <br /> (7 cm70 mm <br />0.07 m <br />) +
2.5 cm25 mm <br />0.025 m <br /> (4.5 cm45 mm <br />0.045 m <br />) +
5-lobed;3-lobed;unlobed;suborbiculate;rhombic;5-lobed;3-lobed;unlobed;suborbiculate;rhombic;5-lobed;3-lobed;unlobed;suborbiculate;rhombic;ovate +
thin +  and thick +
asymmetric +  and symmetric +
ovate +  and round rhombic or reniform unlobed or palmately 3-lobed 5-lobed or 7-lobed +
0.7 cm7 mm <br />0.007 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
1/3;1/2-2/3 +
awl-shaped +  and filiform +
1 cm10 mm <br />0.01 m <br /> (?) +
slender +
0.9 cm9 mm <br />0.009 m <br /> (1 cm10 mm <br />0.01 m <br />) +
not angled +  and 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 Luis Obispo or Jones’s bushmallow +
white +, usually rose +  and pale-pink pinkish mauve or mauve +
campanulate +  and subrotate +
200–900 m +
sparse;copious +
subterminal +
solitary +, 3(-6)-flowered +, loose +, pedunculate +  and clusters +
unisexual +  and bisexual +
subglobose-obovate +, disclike +  and not inflated +
Open chaparral, foothill woodlands +
10-30-armed +  and stalked +
bifurcate +
tough-fibrous +
connate +  and distinct +
simple +, stipulate +, sessile +, subsessile +  and petiolate +
distichous +  and alternate +
0.6 cm6 mm <br />0.006 m <br /> (0.75 cm7.5 mm <br />0.0075 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
distinct +
deltate-lanceolate +  and triangular +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
entire +  and serrate +
smooth-walled +  and 1-celled +
asymmetrically suborbicular +  and obovoid-reniform +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.38 cm3.8 mm <br />0.0038 m <br />) +
7-14-carpellate +
adnate +  and distinct +
0 cm0 mm <br />0 m <br /> (1 cm10 mm <br />0.01 m <br />) +
Flowering late Apr–Jun. +
Leafl. W. Bot. +
minutely stellate-hairy or rarely glabrous +  and papillate-stellate +
black +  and brown +
hairy +  and glabrous +
obovoid-reniform +
persistent +
sessile +  and subsessile +
ascending;erect +
filiform +, linear +  and capitate +
1-2 times number of carpels +
filiform +  and subulate +
7-14-branched +
tomentose-white +
Malacothamnus gracilis +, M. niveus +, Malvastrum fremontii var. niveum +, M. gracile +  and M. niveum +
Malacothamnus jonesii +
Malacothamnus +
species +
glabrate +  and densely hairy +
monoecious +, dioecious +  and hermaphroditic +