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.
Common Name: WILD BUCKWHEAT Habit: Annual to shrub, matted or not. Stem: prostrate to erect, occasionally 0, glabrous or hairy, occasionally glandular. Leaf: basal, sheathing (on stem above basal, beneath other, +- non-sheathing cauline), or cauline, alternate, opposite, or whorled; blades linear to +- round, generally longer than wide, margins flat, wavy, or rolled under; ocreae 0. Inflorescence: variable, glabrous or hairy, occasionally glandular; peduncles 0 or erect to reflexed (pointed down); involucres 1 or in clusters, tubular, glabrous or hairy, teeth generally 4--10, awns 0. Flower: (2)6--100(200), with a stalk-like base ("flower stipe" or "stipe") or not; perianth generally white to red or yellow, glabrous or hairy, occasionally glandular, lobes 6, generally entire; stamens 9. Fruit: generally brown or black, generally obconic, glabrous or hairy; embryo curved or straight. Etymology: (Greek: woolly knees, for hairy nodes of 1st sp. named) Note: One of largest genera in California; stem in descriptions refers to the main stem(s), not branches of inflorescence. A perennial herb allied to Eriogonum austrinum (S. Stokes) Reveal and Eriogonum moranii Reveal of east-central Baja California, with spreading (rather than reflexed or erect) involucres on peduncles < 2 mm, occurring in DMtns (Bristol, Granite mountains), has been known for nearly 25 years yet remains undescribed. Eriogonum puberulum moved to Johanneshowellia. eFlora Treatment Author: James L. Reveal & Thomas J. Rosatti
Habit: Subshrub or shrub, 0.2--1.5 dm, (0.6)1--13(16) dm diam. Stem: 0.05--1.5 dm, 0.1--1 dm, generally tomentose or glabrous. Leaf: cauline, blades (0.3)1--3.5 cm, (0.07)0.1--1.2 cm wide, linear to narrow, tomentose abaxially, less so or glabrous adaxially, margin occasionally rolled under. Inflorescence: 0.5--6(12) cm, 1--10(13) cm wide; branches tomentose to hairy or glabrous; peduncles 0 or generally erect, 0.3--1.5 cm, slender, tomentose to hairy; involucres (1.5)2--3.5(4) mm, 1.3--2.5(3) mm wide, tomentose to hairy or glabrous. Flower: 1.5--3(4) mm, glabrous; perianth yellow or white to pink, orange, rose, red (or cream), lobes oblong to obovate. Fruit: 1.5--3 mm, glabrous. Note: Other varieties in Oregon, Idaho, Nevada, Utah.
Eriogonum microtheca Nutt. var. laxiflorum Hook.
NATIVE Habit: Subshrub (1)2--4(5) dm, 3--8 dm diam. Stem: 0.2--0.6(0.8) dm, generally tomentose to hairy. Leaf: (0.5)1--2(2.5) cm, (0.1)0.2--0.6(0.8) cm wide, narrow, tomentose abaxially, tomentose to hairy adaxially. Inflorescence: (1)2--4(8) cm; branches sparsely tomentose or glabrous; involucres 2--3(3.5) mm, generally +- glabrous. Flower: 2--3 mm; perianth white to pink or rose. Fruit: 2--3 mm. Ecology: Common. Sand, gravel or rocks; Elevation: (400)1500--3200 m. Bioregional Distribution: SNH (e slope), GB; Distribution Outside California: to Washington, Montana, Colorado, northern Arizona. Flowering Time: Jun--Oct Synonyms: Eriogonum confertiflorum Benth.; Eriogonum intricatum (Gand.) Prain; Eriogonum microtheca subsp. confertiflorum (Benth.) S. Stokes; Eriogonum microtheca var. confertiflorum (Benth.) Torr. & A. Gray; Eriogonum microtheca subsp. intricatum Gand.; Eriogonum microtheca subsp. laxiflorum (Hook.) S. Stokes; Eriogonum microtheca subsp. spathulare Gand.; Eriogonum microtheca var. spathulare (Gand.) S. Stokes; Eriogonum spathulare (Gand.) Prain; Eriogonum tenellum Torr. var. grandiflorum Gand.; Eriogonum tenellum var. sessiliflorum Gand. Jepson eFlora Author: James L. Reveal & Thomas J. Rosatti Index of California Plant Names (ICPN; linked via the Jepson Online Interchange) Previous taxon: Eriogonum microtheca var. lapidicola Next taxon: Eriogonum microtheca var. panamintense
Citation for this treatment: James L. Reveal & Thomas J. Rosatti 2012, Eriogonum microtheca var. laxiflorum, in Jepson Flora Project (eds.) Jepson eFlora, https://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=101987, accessed on October 10, 2024.
Citation for the whole project: Jepson Flora Project (eds.) 2024, Jepson eFlora, https://ucjeps.berkeley.edu/eflora/, accessed on October 10, 2024.
No expert verified images found for Eriogonum microtheca var. laxiflorum.
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