Lastarriaea coriacea |
Polygonaceae subfam. eriogonoideae |
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leather-spineflower |
wild buckwheat |
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Habit | Plants 0.2–1.5 × 0.5–3(–5) dm. | Shrubs, subshrubs, or herbs, sometimes nearly arborescent (Eriogonum), perennial, biennial, or annual, homophyllous, polycarpic (rarely monocarpic in Eriogonum); taproot solid or, rarely, chambered (Eriogonum), slender to stout. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Stems | prostrate or decumbent to spreading or erect, sometimes scapose, rarely absent (Eriogonum), without recurved spines, glabrous or pubescent, sometimes glandular; nodes not swollen; tendrils absent; caudex stems tightly compact to spreading and at or just below the soil surface or spreading to erect and above the soil surface, woody; aerial flowering stems decumbent to spreading or erect, arising at nodes of caudex branches, at distal nodes of aerial branches, or directly from the root, slender to stout and solid or slightly to distinctly fistulose, rarely disarticulating in ringlike segments (Eriogonum). |
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Leaves | blades 0.5–3 cm × 0.2–0.8(–1) mm. |
deciduous (persistent in some shrubby and matted Eriogonum species), basal or basal and cauline, rarely only cauline, rosulate, alternate, or infrequently opposite (Goodmania) or in whorls of 3 (Gilmania); stipules absent (possibly vestigial in some perennial species of Chorizanthe); petiole present, sometimes indistinct, not articulate or with extrafloral nectaries; blade simple, rarely lobed (Pterostegia), rarely awn-tipped (Goodmania). |
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Inflorescences | yellowish green to green or red; bracts erect or nearly so, narrowly lanceolate, 0.4–1.5(–2) cm × 0.8–1.5(–2) mm; awns uncinate, (0.5–)1–2(–2.5) mm. |
terminal or terminal and axillary, cymose and dichotomously or trichotomously branched, or racemose, simple or compound umbellate, or capitate; bracts usually connate proximally, leaflike or scalelike, entire apically, sometimes awn-tipped, glabrous or pubescent. |
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Peduncles | absent or erect to deflexed relative to inflorescence branch, sometimes reflexed, straight or curved. |
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Flowers | perianth 2–3.5 mm (including awns); tepals connate ca. 2/3 their length, narrowly lanceolate; filaments 0.5–1 mm; anthers 0.2–0.3 mm. |
(1–)2–30(–100) per involucral structure, occasionally with stipelike base distal to articulations (Eriogonum); perianth accrescent in fruit, mostly white to red, yellow, light green, greenish white, maroon, or purple, urceolate to campanulate, occasionally glandular or pustulose abaxially, nearly always minutely glandular along midvein adaxially, glabrous or pubescent; tepals (5–)6, in 2 whorls of 3, connate proximally, typically not forming tube (except Chorizanthe, Lastarriaea, Mucronea, Pterostegia), petaloid or, rarely, coriaceous (Lastarriaea), monomorphic or dimorphic, entire, emarginate, or lobed to laciniate apically, rarely awn-tipped (Lastarriaea) or apiculate (Eriogonum); nectary a disk at base of ovary; stamens 3, 6, or 9 (variously 3–9 in Chorizanthe, Mucronea); staminodes absent; filaments usually distinct, occasionally forming staminal tube (Chorizanthe); pistils 3-carpellate, homostylous; ovary 1-locular; ovule 1, orthotropous, placentation basal; styles 3, distinct; stigmas capitate. |
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Achenes | 2.5–3 mm. |
brown to black or maroon, homocarpic, winged or unwinged, 3-gonous, less often lenticular or globose-lenticular to globose. |
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Seeds | embryo straight or curved. |
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Involucral | bracts erect, linear, 0.3–1(–1.2) cm × 0.3–1 mm; awns uncinate, 0.5–2 mm. |
structures tubular (involucre) or consisting of a series of individual bractlike lobes (involucral bracts) arranged in whorls or spirals, rarely absent (Gilmania), awns present or absent; involucre cylindric, prismatic, turbinate, campanulate, urceolate, or funnelform with 3–8(–36) usually erect teeth or 4–12 spreading to reflexed lobes (teeth and lobes are distal portions of proximally connate involucral bracts); involucral bracts in 1–3 whorls, rarely in spirals (Johanneshowellia), free or connate only at base, linear to oblanceolate or ovate. |
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2n | = 42, 60. |
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Lastarriaea coriacea |
Polygonaceae subfam. eriogonoideae |
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Phenology | Flowering Feb–Jun. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Habitat | Sandy to gravelly soils in coastal and inland grassland, coastal scrub and chaparral communities, pine-oak woodlands | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Elevation | 0-800 m (0-2600 ft) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Distribution |
CA; Mexico (Baja California)
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Mainly temperate regions of w North America (Alaska to Mexico); uncommon in South America (Argentina and Chile) and e North America (WVa s to c Fla, e to Mo, Okla, and Tex) |
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Discussion | Lastarriaea coriacea grows along the coast from Sonoma County to San Diego County, and in the foothills and mountains from Calaveras County to western Riverside County. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Genera 20, species ca. 325 (19 genera, 281 species in the flora). Detailed habitat, elevation, and distribution data for the eriogonoid genera are maintained by the author and available on the Web at: “Eriogonoideae (Polygonaceae) of North America north of Mexico” (http://www.life.umd.edu/emeritus/reveal/pbio/eriog/key.html). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 5, p. 477. | FNA vol. 5, p. 218. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Parent taxa | Polygonaceae > subfam. Eriogonoideae > Lastarriaea | Polygonaceae | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Synonyms | Chorizanthe coriacea, L. chilensis subsp. californica, Chorizanthe lastarriaea var. californica | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Name authority | (Goodman) Hoover: Leafl. W. Bot. 10: 342. (1966) | Arnott: in M. Napier, Encycl. Brit. ed. 7, 5: 126. (1832) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Web links |