Jepson Flora Project: Jepson Interchange    

link to manual TREATMENT FROM THE JEPSON MANUAL (1993) previous taxon | next taxon
Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
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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.


John R. Reeder

Annual, ± hairy
Stems ascending to erect, unbranched, often fragile, easily breaking apart at nodes
Leaves basal and cauline; collar 0; sheath and blade continuous; blade flat or becoming inrolled when dry
Inflorescence spike-like, partly enclosed by upper sheath or exserted with age; spikelets spirally arranged on axis
Spikelet laterally compressed; glumes entire or irregularly short-toothed; florets 5–40, tardily breaking above glumes and between florets; lemmas entire or minutely toothed, generally with central sharp point, 11–17-veined; palea ± = lemma; anthers exserted, filaments slender, ribbon-like; stigmas 1/3–1/2 style length, sparsely short-hairy
Fruit obovoid or oblong
Species in genus: 3 species: CA, s Baja CA
Etymology: (Anagram of Orcuttia)
Reference: [Reeder 1982 Amer J Bot 69:1082–1095]


T. greenei (Vasey) Reeder


Stem erect, becoming decumbent, 5–15(30) cm; nodes often purplish
Leaf 2–3 cm, < 5 mm wide, curved outward
Inflorescence < 8 cm, exserted with age; upper spikelets crowded, lower ± separated
Spikelet: glumes 3–5 mm, subequal, tip irregularly short-toothed, strongly veined; florets < 40; lemma generally 4–5(6) mm, 9–13-veined; palea slightly < lemma; anthers 3–3.5 mm, whitish
Fruit ± 2 mm, slightly flattened laterally, oblong, minutely wrinkled
Chromosomes: 2n=24
Ecology: Vernal pools
Elevation: < 200 m.
Bioregional distribution: Great Central Valley (Butte, Fresno, Madera, Merced, San Joaquin, Stanislaus, Tehama, Tulare cos.)
Synonyms: Orcuttia g. Vasey
See the CNPS Inventory for information about endangerment and rarity.
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bioregional map for TUCTORIA%20greenei being generated
YOU CAN HELP US make sure that our distributional information is correct and current. If you know that a plant occurs in a wild, reproducing state in a Jepson bioregion NOT highlighted on the map, please contact us with that information. Please realize that we cannot incorporate range extensions without access to a voucher specimen, which should (ultimately) be deposited in an herbarium. You can send the pressed, dried collection (with complete locality information indicated) to us (e-mail us for details) or refer us to an accessioned herbarium specimen. Non-occurrence of a plant in an indicated area is difficult to document, but we will especially value your input on those types of possible errors (see automatic conversion of distribution data to maps).

Retrieve Jepson Interchange Index to Plant Names entry for Tuctoria greenei
Retrieve dichotomous key for Tuctoria
Retrieve multiple-entry key (MEKA) for Tuctoria
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