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Malacothrix

Malacothrix
Family: Asteraceae
Malacothrix image
Matt Lavin
  • FNA
  • Resources
W. S. Davis in Flora of North America (vol. 19, 20 and 21)
Annuals or perennials, 2-70(-200) cm; taprooted (rhizomatous or taproots becoming caudices in M. saxatilis). Stems 1-15 (usually from basal rosettes), usually erect, sometimes ± prostrate, usually branched (scapiform in M. californica), usually glabrous (sometimes piloso-hirsute, stipitate-glandular, or tomentose to arachnose or puberulent, at least proximally or in leaf axils). Leaves usually basal and cauline; sessile; blades mostly oblong or lanceolate to obovate, oblanceolate, or spatulate (often pinnately lobed), ultimate margins entire or ± dentate (faces usually glabrous, sometimes piloso-hirsute or tomentose to arachnose or puberulent). Heads usually in corymbiform to paniculiform arrays (borne singly in M. californica). Peduncles not inflated distally, usually bracteate. Calyculi 0 (outer phyllaries intergrading with inner) or of 3-30+, ± deltate or lanceolate to linear or subulate, subequal to unequal bractlets (in 1-2 series distinct from phyllaries, margins usually hyaline, faces usually glabrous, sometimes arachnose, rarely stipitate-glandular). Involucres usually broadly to narrowly campanulate, sometimes hemispheric, (5-22+ ×) 2-22+ mm diam. Phyllaries either (without calyculi) 25-80+ in 4-6+ series and orbiculate to oblong, lance-oblong, lanceolate, or linear, unequal, or (with calyculi) 12-25+ in 2-3 series and oblong or lanceolate to linear, subequal; margins ± hyaline, 0.05-2.5 mm, apices obtuse to acute or acuminate. Receptacles flat to ± convex, pitted or smooth, sometimes bristly, epaleate. Florets 15-270; corollas yellow or white (sometimes reddish or lavender abaxially; outer ligules exserted 1-15 mm). Cypselae (monomorphic) stramineous to brown or purplish brown, ± prismatic or cylindro-fusiform, not beaked, ribs 15 (often 5 more prominent than others, apices of ribs sometimes projecting and forming coronas subtending pappi), usually glabrous (sometimes minutely hirtellous or muriculate); pappi 0, or (single or double) persistent, whitish, crenate crowns or rings of (1-)8-25+ teeth (mostly 0.05-0.1 mm) plus 0-6, coarse, smooth bristles (setiform scales), all in ± 1 series, subtending (i.e., exterior to) the readily falling, inner (or single and only) pappi of 15-35, basally coherent, white, fine, smooth to barbellulate or (proximally) ± plumose bristles in 1 series (falling all together or in groups). x = 7, 9.
Species within inventory project: Arizona Flora
Malacothrix clevelandii
Media resource of Malacothrix clevelandii
Map not
Available
Malacothrix coulteri
Media resource of Malacothrix coulteri
Map not
Available
Malacothrix fendleri
Media resource of Malacothrix fendleri
Map not
Available
Malacothrix glabrata
Media resource of Malacothrix glabrata
Map not
Available
Malacothrix sonchoides
Media resource of Malacothrix sonchoides
Map not
Available
Malacothrix sonorae
Media resource of Malacothrix sonorae
Map not
Available
Malacothrix stebbinsii
Media resource of Malacothrix stebbinsii
Map not
Available
Malacothrix torreyi
Media resource of Malacothrix torreyi
Map not
Available
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This project was made possible in part by the Institute of Museum and Library Services [MG-70-19-0057-19].

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