Malacothamnus palmeri

(S. Watson) Greene

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

Common names: Palmer’s or Santa Lucia bushmallow
EndemicIllustrated
Basionym: Malvastrum palmeri S. Watson Proc. Amer. Acad. Arts 12: 250. 1877
Synonyms: Malacothamnus palmeri var. involucratus (B. L. Robinson) Kearney M. palmeri var. lucianus Kearney Malvastrum involucratum M. palmeri var. involucratum (B. L. Robinson) McMinn
Treatment appears in FNA Volume 6. Treatment on page 285. Mentioned on page 281.

Shrubs, 1.5–2.5 m, branches stout, indument white-canescent, grayish, or tawny, sparse to dense, stellate hairs sessile or stalked, glandular and 1–few-armed hairs sometimes also present, arms to 3 mm. Leaf-blades ovate to broadly ovate, unlobed or 3-lobed or 5-lobed, to 7–8 cm, thin or thick, surfaces: sparsely to densely grayish to tawny-hairy, basal sinus open, not overlapping. Inflorescences terminal, headlike or, sometimes, short-spicate, flower clusters sessile, densely flowered, subtended by conspicuous bracts; stipules marginally connate, enclosing young flower clusters; involucellar bractlets distinct, sometimes basally adnate to calyx, linear to lanceolate, 8–16 (–21) × 1–3 (–5) mm, 2/3 –1 1/3 times calyx length. Flowers: calyx (8–) 10–16 (–20) mm, lobes ovate to deltate-lanceolate, 5–15 × 2.5–5.5 mm, ca. 2 times as long as wide, slightly exceeding to 4 times tube length, apex acuminate, grayish to tawny-hairy, hairs stellate, arms to 3.5 mm and sometimes simple-glandular; petals rose-pink or pale-pink to nearly white, 1.4–2 (–3) cm. Mericarps 2.5–4 (–5) mm. 2n = 34.


Phenology: Flowering Mar–Jul.
Habitat: Chaparral
Elevation: 30–800 m

Discussion

Malacothamnus palmeri occurs in the central, outer Coast Ranges; its morphology is variable. Plants from Jolon and the Carmel Valley, Monterey County, have been called var. involucratus; they are recognized by cordate leaves, sparse indument (leaves adaxially glabrate), broad bracts to 20 mm wide subtending and partially enclosing the young flower clusters, relatively broad involucellar bractlets, calyx measurements in the lower range (to 1.5 cm), and nearly white petals 1–3 cm. They intergrade with the typical form and, in plants with short-spicate inflorescences, approach M. aboriginum. Plants from near Arroyo Seco, Monterey County, with simple and glandular hairs and generally darker rose petals have been named var. lucianus; they are otherwise similar to the typical variety.

Selected References

None.

Lower Taxa

None.

No values specified.

... more about "Malacothamnus palmeri"
loculicidal +
acuminate +
tawny-hairy +
muticous +
0 cm0 mm <br />0 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
David M. Bates +
(S. Watson) Greene +
not overlapping +
cordate +  and truncate or cuneate +
Malvastrum palmeri +
7 cm70 mm <br />0.07 m <br /> (8 cm80 mm <br />0.08 m <br />) +
ovate;broadly ovate unlobed or 3-lobed or 5-lobed +
thick +  and thin +
asymmetric +  and symmetric +
ovate +  and round rhombic or reniform unlobed or palmately 3-lobed 5-lobed or 7-lobed +
conspicuous +
1.6 cm16 mm <br />0.016 m <br /> (2.1 cm21 mm <br />0.021 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
adnate +  and distinct +
linear +  and lanceolate +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
1.6 cm16 mm <br />0.016 m <br /> (2 cm20 mm <br />0.02 m <br />) +
not inflated +
not accrescent +
1 cm10 mm <br />0.01 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
indehiscent +  and loculicidal +
Palmer’s or Santa Lucia bushmallow +
white +, usually rose +  and pale-pink pinkish mauve or mauve +
campanulate +  and subrotate +
30–800 m +
sparse;copious +
subterminal +
flowered +  and sessile +
unisexual +  and bisexual +
subglobose-obovate +, disclike +  and not inflated +
Chaparral +
stalked +  and sessile +
bifurcate +
, +  and headlike +
tough-fibrous +
connate +  and distinct +
simple +, stipulate +, sessile +, subsessile +  and petiolate +
distichous +  and alternate +
ovate +  and deltate-lanceolate +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.55 cm5.5 mm <br />0.0055 m <br />) +
entire +  and serrate +
smooth-walled +  and 1-celled +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
asymmetrically suborbicular +  and obovoid-reniform +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
7-14-carpellate +
2 cm20 mm <br />0.02 m <br /> (3 cm30 mm <br />0.03 m <br />) +
pale-pink;nearly white +
adnate +  and distinct +
1.4 cm14 mm <br />0.014 m <br /> (2 cm20 mm <br />0.02 m <br />) +
Flowering Mar–Jul. +
Leafl. Bot. Observ. Crit. +
minutely stellate-hairy or rarely glabrous +  and papillate-stellate +
black +  and brown +
hairy +  and glabrous +
obovoid-reniform +
persistent +
Endemic +  and Illustrated +
sessile +  and subsessile +
ascending;erect +
filiform +, linear +  and capitate +
1-2 times number of carpels +
filiform +  and subulate +
7-14-branched +
Malacothamnus palmeri var. involucratus +, M. palmeri var. lucianus +, Malvastrum involucratum +  and M. palmeri var. involucratum +
Malacothamnus palmeri +
Malacothamnus +
species +
glabrate +  and densely hairy +
monoecious +, dioecious +  and hermaphroditic +