Jepson Flora Project: Jepson Interchange    

 
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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
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ASTERACEAE

SUNFLOWER FAMILY

David J. Keil, Family Editor and author, except as specified

Annual to tree
Leaves basal or cauline, alternate to whorled, simple to compound
Inflorescence: 1° inflorescence a head, each resembling a flower, 1–many, generally arrayed in cymes, generally subtended by ± calyx-like involucre; flowers 1–many per head
Flowers bisexual, unisexual, or sterile, ± small, of several types; calyx 0 or modified into pappus of bristles, scales, or awns, which is generally persistent in fruit; corolla radial or bilateral (rarely 0), lobes generally (0)4–5; stamens 4–5, anthers generally fused into cylinder around style, often appendaged at tips, bases, or both, filaments generally free, generally attached to corolla near throat; pistil 1, ovary inferior, 1-chambered, 1-seeded, style 1, branches 2, generally hair-tufted at tip, stigmas 2, generally on inside of style branches
Fruit: achene, cylindric to ovoid, generally deciduous with pappus attached
Genera in family: ± 1300 genera, 21,000 species (largest family of dicots): worldwide. Largest family in CA. Also see tribal key to CA genera: Strother 1997 Madroño 44(1):1–28. See glossary p. 25 for illustrations of general family characteristics.

PSILOCARPHUS

WOOLLY-HEADS, WOOLLY MARBLES

James D. Morefield

Annual, gray to green, cobwebby to tomentose
Stems generally several from base, generally spreading, < 20 cm, ± forked; central axis generally 0 or not dominant
Leaves simple, generally opposite, ± sessile, < 3 cm, ± obtuse, entire (uppermost ± alternate or seeming whorled, generally ± appressed to heads)
Inflorescence: heads disciform, sessile, solitary or in small groups, generally spheric; bracts like leaves; phyllaries 0; receptacle 1–2 X > wide, ± obovoid, generally entire, chaffy; chaff scales each enclosing a pistillate flower, falling with a fruit, length generally < 3 X width, generally ± obovoid, bulged upward, woolly, net-veined, tip scarious-winged, offset to inner edge, generally ± 2/3 the distance from base to top of scale, projected inward, beak-like, hidden in head
Pistillate flowers in many series, each subtended by a chaff scale; corollas tubular
Disk flowers staminate, 2–10, not subtended by chaff scales; ovary vestigial
Fruit smooth, shiny; pappus 0
Species in genus: 3–5 ill-defined species: w North America, s South America
Etymology: (Greek: slender chaff)
Reference: [Cronquist 1950 Res Stud State Coll WA 18:71–89]
Spp. appear to intergrade, need detailed study.

Native

P. tenellus Nutt.

Plants variously tomentose
Stems generally several from base, spreading; central axis 0 or not dominant
Leaves: uppermost oblanceolate to obovate, longest < 16 mm, generally 1.5–5 X > wide
Inflorescence: largest head < 6 mm; longest chaff scale generally 1.8–2.7 mm
Disk flowers 0.8–1.5 mm, 4–5-lobed
Fruit 0.6–1.2 mm, ± obovoid
Ecology: Vernal pools, coastal dunes, dry disturbed soil
Elevation: < 2000 m.
Bioregional distribution: California Floristic Province
Distribution outside California: to British Columbia, Idaho, nw Baja California, also in c Chile

Native

var. globiferus (DC.) Morefield

ROUND WOOLLY MARBLES

Plants variously tomentose
Leaves: uppermost ± appressed to and concealing heads, ovate to widely elliptic, generally 1.5–2 X > wide
Disk flowers generally 4-lobed
Ecology: UNCOMMON. Vernal pools, coastal dunes
Elevation: 0–700 m.
Bioregional distribution: c&s Sierra Nevada Foothills, San Joaquin Valley, Central Coast, San Francisco Bay Area
Distribution outside California: c Chile
Synonyms: var. tenuis (Eastw.) Cronquist; P. globiferus Nutt. misapplied
A similar SnBr form seems best assigned to P. brevissimus var. b.

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bioregional map for PSILOCARPHUS%20tenellus%20var.%20globiferus being generated
 
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Retrieve Jepson Interchange Index to Plant Names entry for Psilocarphus tenellus var. globiferus
Retrieve dichotomous key for Psilocarphus
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