Common Name: BUCKWHEAT FAMILY Habit: Annual to shrub [tree]. Stem: nodes swollen or not. Leaf: simple, basal or cauline, generally alternate; ocreae present or 0, generally scarious, persistent or not. Inflorescence: flower clusters in axillary to terminal cyme-, panicle-, raceme-, spike-, umbel- or head-like arrangements, entire inflorescence or main inflorescence branches generally subtended by bracts ("inflorescence bracts"); peduncles present or 0; flower clusters in Eriogoneae-Eriogonoideae subtended by involucre of >= 1 free or +- fused, sometimes awn-tipped bracts ("involucre bracts") or, in Polygonoideae and rarely in Eriogonoideae, not (if bracts completely fused, involucre "tubular"); pedicels in Eriogoneae each often subtended by 2 free, transparent, linear bractlets or in Polygonoideae all subtended by 2+ fused, membranous, wide bractlets. Flower: generally bisexual, small, 1--200 per node; perianth parts 2--6, generally in 2 whorls, free or basally fused, generally petal-like, often +- concave adaxially, often darker at midvein, often turning +- red or +- brown in age; stamens [1]3 or 6--9 in 2 whorls; ovary superior, 1-chambered, ovule 1, styles 1--3. Fruit: achenes, included in or exserted from perianth, generally 3-angled, ovoid or elliptic, generally glabrous. Genera In Family: 48 genera, +- 1200 species: worldwide, especially northern temperate; some cultivated for food (Coccoloba, sea-grape; Fagopyrum, Rheum, Rumex) or ornamental (Antigonon, lovechain; Coccoloba; Muehlenbeckia; Persicaria; Polygonum), a few timbered (Coccoloba; Triplaris). Several (Emex; Fallopia; Persicaria; Polygonum; Rumex) are weeds. Note: Treatment of genera in Eriogonoideae based on monographic work of James L. Reveal. Involucre number throughout is number (1--many) per ultimate grouping, at tips of ultimate branches; flower number is per flower cluster or involucre, unless otherwise stated. Fagopyrum esculentum Moench not naturalized, considered an historical waif (or garden weed +- presently), therefore not treated. eFlora Treatment Author: Mihai Costea, except as noted Scientific Editor: Thomas J. Rosatti, Bruce G. Baldwin.
Etymology: (Greek: spurred roof, for basal awns of involucre) eFlora Treatment Author: James L. Reveal & Thomas J. Rosatti
Centrostegia thurberi A. Gray
NATIVE Habit: Annual, erect, 0.3--2(3) dm, sparsely glandular. Leaf: basal; blades (0.5)1--3.5(4) cm, 0.3--0.8(1) cm wide, glabrous; ocreae 0. Inflorescence: terminal, cyme-like; peduncles 0; involucre 1, (2)3--6(8) mm, tubular; basal awns 3, 0.2--2 mm, teeth 5, each with 0.3--1 mm awn. Flower: 2, 2--3(3.5) mm, hairy; perianth white to pink, lobes 6, 2-lobed; stamens 9. Fruit: brown, obconic, 2--2.5 mm, glabrous; embryo curved. Chromosomes: n=19. Ecology: Common. Sand or gravel; Elevation: 300--2400 m. Bioregional Distribution: s SnJV, e SCoRI, TR, SNE, D; Distribution Outside California: to Utah, Arizona, northwestern Mexico. Flowering Time: Mar--Jul Synonyms: Centrostegia thurberi var. macrotheca (J.T. Howell) Goodman; Chorizanthe thurberi (A. Gray) S. Watson; Chorizanthe thurberi var. cryptantha Curran; Chorizanthe thurberi var. macrotheca J.T. Howell Jepson eFlora Author: James L. Reveal & Thomas J. Rosatti Index of California Plant Names (ICPN; linked via the Jepson Online Interchange) Previous taxon: Centrostegia Next taxon: Chorizanthe
Botanical illustration including Centrostegia thurberi
Citation for this treatment: James L. Reveal & Thomas J. Rosatti 2012, Centrostegia thurberi, in Jepson Flora Project (eds.) Jepson eFlora, https://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=18606, accessed on December 03, 2024.
Citation for the whole project: Jepson Flora Project (eds.) 2024, Jepson eFlora, https://ucjeps.berkeley.edu/eflora/, accessed on December 03, 2024.
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(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurrence).
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Blue markers indicate specimens that map to one of the expected Jepson geographic subdivisions (see left map). Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
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CCH collections by month
Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa, if there are more than 1 infraspecific taxon in CA.
Blue line denotes eFlora flowering time (fruiting time in some monocot genera).
