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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 checklist: Sage-Grouse Preferred Forbs, NV
Malacothrix arachnoidea
Media
not available
Map not
Available
Malacothrix blairii
Media
not available
Map not
Available
Malacothrix californica
Media resource of Malacothrix californica
Map not
Available
Malacothrix clevelandii
Media resource of Malacothrix clevelandii
Map not
Available
Malacothrix coulteri
Media resource of Malacothrix coulteri
Map not
Available
Malacothrix crispifolia
Media
not available
Map not
Available
Malacothrix fendleri
Media resource of Malacothrix fendleri
Map not
Available
Malacothrix floccifera
Media resource of Malacothrix floccifera
Map not
Available
Malacothrix foliosa
Media resource of Malacothrix foliosa
Map not
Available
Malacothrix glabrata
Media resource of Malacothrix glabrata
Map not
Available
Malacothrix implicata
Media resource of Malacothrix implicata
Map not
Available
Malacothrix incana
Media resource of Malacothrix incana
Map not
Available
Malacothrix indecora
Media resource of Malacothrix indecora
Map not
Available
Malacothrix insularis
Media resource of Malacothrix insularis
Map not
Available
Malacothrix junakii
Media resource of Malacothrix junakii
Map not
Available
Malacothrix obtusa
Media resource of Malacothrix obtusa
Map not
Available
Malacothrix parviflora
Media resource of Malacothrix parviflora
Map not
Available
Malacothrix phaeocarpa
Media resource of Malacothrix phaeocarpa
Map not
Available
Malacothrix polycephala
Media
not available
Map not
Available
Malacothrix saxatilis
Media resource of Malacothrix saxatilis
Map not
Available
Malacothrix senecioides
Media
not available
Map not
Available
Malacothrix similis
Media resource of Malacothrix similis
Map not
Available
Malacothrix sonchoides
Media resource of Malacothrix sonchoides
Map not
Available
Malacothrix sonorae
Media resource of Malacothrix sonorae
Map not
Available
Malacothrix squalida
Media resource of Malacothrix squalida
Map not
Available
Malacothrix stebbinsii
Media resource of Malacothrix stebbinsii
Map not
Available
Malacothrix succulenta
Media resource of Malacothrix succulenta
Map not
Available
Malacothrix torreyi
Media resource of Malacothrix torreyi
Map not
Available
Malacothrix xanthii
Media
not available
Map not
Available
Malacothrix xanti
Media resource of Malacothrix xanti
Map not
Available
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