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Jones' bush-mallow, San Luis obispo or Jones' bushmallow, slender bushmallow

foothill bush mallow, horehound bushmallow, pink-flower bushmallow

Habit 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. 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 ash green, ovate, ± rhombic, or suborbiculate, unlobed or 3- 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.

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

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.

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 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.

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

2.5–3.8 mm.

2–3.2 mm.

2n

= 34.

= 34.

Malacothamnus jonesii

Malacothamnus marrubioides

Phenology Flowering late Apr–Jun. Flowering Apr–Jun(–Aug).
Habitat Open chaparral, foothill woodlands Chaparral, washes, hillsides
Elevation 200–900 m (700–3000 ft) 400–1100 m (1300–3600 ft)
Distribution
from FNA
CA
[WildflowerSearch map]
[BONAP county map]
from FNA
CA; Mexico (Baja California)
[WildflowerSearch map]
[BONAP county map]
Discussion

Malacothamnus jonesii is known from the central Coast Ranges.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

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. FNA vol. 6, p. 284.
Parent taxa Malvaceae > subfam. Malvoideae > Malacothamnus Malvaceae > subfam. Malvoideae > Malacothamnus
Sibling taxa
M. abbottii, M. aboriginum, M. clementinus, M. davidsonii, M. densiflorus, M. fasciculatus, M. fremontii, M. marrubioides, M. palmeri
M. abbottii, M. aboriginum, M. clementinus, M. davidsonii, M. densiflorus, M. fasciculatus, M. fremontii, M. jonesii, M. palmeri
Synonyms Malvastrum jonesii, M. gracilis, M. niveus, Malvastrum fremontii var. niveum, M. gracile, M. niveum Malvastrum marrubioides, M. gabrielense
Name authority (Munz) Kearney: Leafl. W. Bot. 6: 135. (1951) (Durand & Hilgard) Greene: Leafl. Bot. Observ. Crit. 1: 208. (1906)
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