Difference between revisions of "Malacothamnus aboriginum"

(B. L. Robinson) Greene

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

Common names: Indian Valley bushmallow
Endemic
Basionym: Malvastrum aboriginum B. L. Robinson in A. Gray et al., Syn. Fl. N. Amer. 1(1,2): 311. 1897
Synonyms: Sphaeralcea aboriginum (B. L. Robinson) Jepson
Treatment appears in FNA Volume 6. Treatment on page 285. Mentioned on page 280, 281.
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|publication year=1906
 
|publication year=1906
 
|special status=Endemic
 
|special status=Endemic
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f50eec43f223ca0e34566be0b046453a0960e173/coarse_grained_fna_xml/V6/V6_520.xml
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|source xml=https://bibilujan@bitbucket.org/aafc-mbb/fna-data-curation.git/src/bb6b7e3a7de7d3b7888a1ad48c7fd8f5c722d8d6/coarse_grained_fna_xml/V6/V6_520.xml
 
|subfamily=Malvaceae subfam. Malvoideae
 
|subfamily=Malvaceae subfam. Malvoideae
 
|genus=Malacothamnus
 
|genus=Malacothamnus

Revision as of 23:41, 27 May 2020

Subshrubs or shrubs, 2–3 m, branches ± stout, indument grayish to tawny, shaggy-tomentose, stellate hairs sessile or stalked, many-armed. Leaf blades ovate, broadly ovate, or round, 3- or 5-lobed, 4–7(–12) cm, thin or thick, surfaces: sparsely to densely grayish- to tawny-short-stellate-hairy, basal sinus open, not overlapping. Inflorescences interrupted, spicate or racemose, flower clusters sessile or subsessile, subtended by conspicuous bracts, usually densely flowered, usually 10 flowers per node; involucellar bractlets distinct or basally connate, subcordate, narrow-elliptic, or ± round, 6–15 × (1–)3–9 mm, 2/3 to exceeding calyx length. Flowers: calyx strongly plicate, angled or winged in bud, 8–17 mm, lobes subcordate, ovate, or ± round, 5–11 × 3.5–10 mm, slightly longer than broad, ca. 2 times tube length, apex abruptly acuminate, stellate-hairy, hairs many-armed; petals pale pink to rose, 1–2 cm. Mericarps 2.5–3.5 mm. 2n = 34.


Phenology: Flowering Apr–Jun, Aug–Oct.
Habitat: Chaparral
Elevation: 100–800(–1700) m

Discussion

Malacothamnus aboriginum occurs principally in the central inner Coast Ranges and in the Laguna Mountains in San Diego County. There, plants have involucellar bractlets about 1 mm wide but otherwise appear to be M. aboriginum; these have sometimes been assigned to M. densiflorus. The character of the often connate, wide involucellar bractlets is distinctive of M. aboriginum.

Selected References

None.

Lower Taxa

None.