Jepson Flora Project: Jepson Interchange    

 
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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
For up-to-date information about California vascular plants, visit the Jepson eFlora.

POACEAE

GRASS FAMILY

James P. Smith, Jr., except as specified

Annual to bamboo-like; roots generally fibrous
Stem generally round, hollow; nodes swollen, solid
Leaves alternate, 2-ranked, generally linear; sheath generally open; ligule membranous or hairy, at blade base
Inflorescence various (of generally many spikelets)
Spikelet: glumes generally 2; florets (lemma, palea, flower) 1–many; lemma generally membranous, sometimes glume-like; palea generally ± transparent, ± enclosed by lemma
Flower generally bisexual, minute; stamens generally 3; stigmas generally 2, generally plumose
Fruit: achene-like grain
Genera in family: 650–900 genera; ± 10,000 species: worldwide; greatest economic importance of any family (wheat, rice, maize, millet, sorghum, sugar cane, forage crops, ornamental, weeds; thatching, weaving, building materials)
Reference: [Hitchcock 1951 Manual grasses US, USDA Misc Publ 200; Clayton & Renvoise 1986 Kew Bull Add Series 13]
See Glossary p. 26 for illustrations of general family characteristics. Generally wind-pollinated.

LAMARCKIA

GOLDENTOP

Lynn G. Clark


Species in genus: 1 sp.: native to Medit, naturalized in similar climates worldwide
Etymology: (J.B. Lamarck, French botanist, 1744–1829)

Introduced

L. aurea (L.) Moench

Annual, cespitose, glabrous
Stem generally erect, 7–40 cm
Leaves cauline, ± evenly distributed; ligule 3–7 mm, membranous, glabrous, tip ± irregularly cut; blade 2.5–9 cm, 2.5–7 mm wide, flat
Inflorescence panicle-like, terminal, 2–8 cm, dense, golden yellow to purplish; axis short-white-hairy in branch axils; spikelets short-stalked, with 1 fertile and 1–3 sterile spikelets in spreading to drooping clusters, each cluster generally falling as 1 unit
Fertile spikelet: glumes 2.5–4 mm, ± equal, generally = spikelet; florets 2; lower floret fertile, 2.5–3 mm, lemma awned from near tip, awn 6–7 mm, straight; upper floret sterile, ± 0.5 mm, awn 4–5 mm
Sterile spikelet 6–9 mm, >> glumes, linear; glumes > lower floret; florets 5–8; lemmas ± overlapping, 1.5–2 mm, obtuse, tip ± fringed, awn 0 (stalk base sometimes with a reduced, sterile spikelet that is like the fertile in size and shape)
Chromosomes: n=7
Ecology: Open ground, moist seeps, rocky hillsides, sandy soil
Elevation: < 660 m.
Bioregional distribution: California
Distribution outside California: Arizona; native to Mediterranean
Flowering time: Feb–May
Somewhat weedy

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bioregional map for LAMARCKIA%20aurea being generated
 
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Retrieve Jepson Interchange Index to Plant Names entry for Lamarckia aurea
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