Higher Taxonomy
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.
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Johanneshowellia
Habit: Annual, weakly erect to spreading, silky-puberulent. Leaf: basal; blades obovate to +- round [+- reniform], awns 0; ocreae 0. Inflorescence: terminal, cyme-like; peduncles 0; involucre bracts obscure, 4--7 in a spiral, narrow, awns 0. Flower: 4--7, glabrous, smooth or papillate; perianth white or pale +- yellow to rose or red, lobes 6, entire; stamens 9. Fruit: light brown, obconic, glabrous; embryo curved. Species In Genus: 2 species: western North America. Etymology: (John Thomas Howell, 1903--1994, Eriogonum scholar, assistant to Alice Eastwood and her successor as Curator of Botany of the California Academy of Sciences) Jepson eFlora Author: James L. Reveal & Thomas J. Rosatti Reference: Reveal 2004 Brittonia 56:299--306 Index of California Plant Names (ICPN; linked via the Jepson Online Interchange)
Previous taxon: Hollisteria lanataNext taxon: Johanneshowellia puberula
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Citation for this treatment: James L. Reveal & Thomas J. Rosatti 2012, Johanneshowellia, in Jepson Flora Project (eds.) Jepson eFlora, https://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=82508, accessed on April 19, 2024.
Citation for the whole project: Jepson Flora Project (eds.) 2024, Jepson eFlora, https://ucjeps.berkeley.edu/eflora/, accessed on April 19, 2024.
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