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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.

BLENNOSPERMA

Robert Ornduff

Annual < 30 cm, monoecious, ± glabrous
Stem branched, erect
Leaves cauline, alternate, < 15 cm, entire or lobed
Inflorescence: heads radiate, borne in cymes; phyllaries in 1 series, thin, margins clear; receptacle flat, naked
Ray flowers 6–13, pistillate, (pistillate flowers without corollas sometimes also present); ligules ± yellow (or 0)
Disk flowers 2–100, staminate; corolla yellow; anthers obcordate, pollen yellow or white; style undivided, tip head-like
Fruit 2–4.5 mm, obovoid, generally papillate (if so, gray, sticky when wet); pappus 0
Species in genus: 3 species: CA & Chile
Etymology: (Greek: slimy seed)
Reference: [Ornduff 1964 Brittonia 16:289–295]

Native

B. nanum (Hook.) S.F. Blake


Leaves 0.5–6 cm, linear, pinnately lobed; lobes 3–15, short, linear
Inflorescence: involucre 5–6 mm
Ray flowers: ligules 3–7 mm, yellow or rarely white, ± purple on back; stigma yellow; pistillate flowers without corollas present
Disk flowers: stigmas and pollen white or yellow
Fruit 2.5–4.5 mm, smooth or ridged
Ecology: Grassland, scrub, woods, generally wet, open areas
Elevation: < 1600 m.
Bioregional distribution: North Coast, North Coast Ranges, Sierra Nevada Foothills, Great Central Valley, Central Western California, South Coast, Channel Islands.

Native

var. robustum J.T. Howell

POINT REYES BLENNOSPERMA


Disk flowers 60–100; pollen yellow
Fruit 3–4.5 mm, ridged, generally papillate
Chromosomes: 2n=14
Ecology: Grassy places in shrubs
Elevation: < 100 m.
Bioregional distribution: c North Coast (Fort Bragg, Mendocino Co.), n Central Coast (Point Reyes peninsula, Marin Co.).Fls late spring. Some populations on Point Reyes peninsula are intermediate to var. nanum in fruit length, pollen color
Horticultural information: In cultivation.

Information on Distribution was contributed by Clare Golec (Apr 2003):
Blennosperma nanum var. robustum the geographic range should include NCo (Mendocino Co., Fort Bragg coastal bluffs)
See the CNPS Inventory for information about endangerment and rarity.
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bioregional map for BLENNOSPERMA%20nanum%20var.%20robustum being generated
 


Retrieve Jepson Interchange Index to Plant Names entry for Blennosperma nanum var. robustum
Retrieve dichotomous key for Blennosperma
Retrieve multiple-entry key (MEKA) for Blennosperma
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