Flora of North America species comparison

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Malacothamnus marrubioides

foothill bush mallow, horehound bushmallow, pink-flower bushmallow
Habit Subshrubs, 1–2 m, branches slender, indument tawny, moderately dense, often viscid, not shaggy, stellate hairs sessile or stalked, not bristly, few–many-armed, glandular hairs usually abundant.
Leaf

blades broadly ovate or suborbiculate, unlobed or 3- or 5-lobed, 3–6(–8) cm, surfaces: moderately to copiously hairy, hairs grayish to tawny, 10–30-armed, basal sinus open, not overlapping.
Inflorescences

usually short, interrupted, spicate to racemose, flower clusters sessile or short-pedunculate, glomerate to open, usually leafy;

involucellar bractlets filiform, 5–13 × 1 mm, mostly 2/3 to equaling calyx length.
Flowers

calyx angled or slightly winged in bud, 7–15 mm, lobes lanceolate, triangular, or ovate, 4.5–12 × 1.7–3(–4) mm, 2–3 times as long as wide, 2–3 times tube length, apex long-acuminate, densely stellate-hairy, hairs many-armed;

petals pink, to 2 cm.
Mericarps

2–3.2 mm.
2n

= 34.

Malacothamnus marrubioides
Phenology Flowering Apr–Jun(–Aug).
Habitat Chaparral, washes, hillsides
Elevation 400–1100 m (1300–3600 ft)
Distribution
from FNA
CA; Mexico (Baja California)
[WildflowerSearch map]
[BONAP county map]
Discussion

Malacothamnus marrubioides is reported from lower elevations of the Sierra Nevada, and is known otherwise from the Transverse Ranges of southern California and Coast Ranges of Baja California.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 6, p. 284.
Parent taxa Malvaceae > subfam. Malvoideae > Malacothamnus
Sibling taxa
M. abbottii, M. aboriginum, M. clementinus, M. davidsonii, M. densiflorus, M. fasciculatus, M. fremontii, M. jonesii, M. palmeri
Synonyms Malvastrum marrubioides, M. gabrielense
Name authority (Durand & Hilgard) Greene: Leafl. Bot. Observ. Crit. 1: 208. (1906)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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