Oxytheca dendroidea subsp. dendroidea |
Oxytheca dendroidea |
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narrow-leaf oxytheca, tall oxytheca, treelike puncture-bract, treeline puncturebract |
narrow-leaf oxytheca, treelike puncture-bract |
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Habit | Plants erect to spreading, 0.4–4 × 0.3–4.5 dm. | |
Stems | sparsely to densely glandular. |
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Leaf | blades linear to linear-oblanceolate, 1–4.5 × 0.1–0.7 cm, densely hirsute, sparsely glandular. |
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Inflorescences | open to diffuse, 0.5–4 dm; bracts (2–)3(–4) at first node, otherwise 2–3 and distinct or basally connate, linear to subulate or triangular, 1–18 × 0.5–4 mm, scalelike or sometimes leaflike, hirsute and glandular; awns 0.2–0.5 mm, often absent at distal nodes. |
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Peduncles | occasionally absent at distal nodes, erect or deflexed, slender, 0.5–1.5 cm. |
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Involucres | 1–2 mm, typically glabrous, rarely with few scattered hairs abaxially; teeth (3–)4; awns grayish, 0.5–3 mm. |
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Flowers | 2–6; perianth white to pink, 1–2 mm, glabrous or strigose and sparsely glandular abaxially; tepals dimorphic, margins essentially entire, those of outer whorl elliptic to ovate and pubescent adaxially, those of inner whorl elliptic or oblong to narrowly ovate and glabrous or sometimes strigose adaxially proximally; filaments 0.5–1.5 mm, glabrous; anthers cream to red, oval, 0.2–0.3 mm. |
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Achenes | yellow-brown to maroon, 2–2.5 mm. |
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2n | = 40. |
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Oxytheca dendroidea subsp. dendroidea |
Oxytheca dendroidea |
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Phenology | Flowering Jun–Oct. | |
Habitat | Dry, sandy to rocky flats, washes, and slopes in mixed grassland, saltbush, sagebrush communities, pinyon and/or juniper and montane conifer woodlands | |
Elevation | 300-3000 m (1000-9800 ft) | |
Distribution |
CA; ID; NV; OR; WA; WY |
CA; ID; NV; OR; WA; WY; s South America
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Discussion | Subspecies dendroidea is common and widespread in western North America from southeastern Oregon to southwestern Wyoming southward into eastern California (as far south as Inyo County), Nevada (to Nye County), but surprisingly unknown from northern Utah. Populations in Washington and Wyoming are extensions of the Snake River Plains populations found in Idaho. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Subspecies 2 (1 in the flora). Subspecies chilensis (J. Rémy) Ertter is restricted to the Andes of Chile and Argentina. It, like another annual, Chorizanthe commissuralis J. Rémy, which is closely allied to our western C. brevicornu, is probably a recent introduction into South America (J. L. Reveal 1978; B. Ertter 1980; O. Shields and Reveal 1988). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 5, p. 435. | FNA vol. 5, p. 435. |
Parent taxa | ||
Sibling taxa | ||
Subordinate taxa | ||
Synonyms | Eriogonum dendroideum | |
Name authority | unknown | Nuttall: Proc. Acad. Nat. Sci. Philadelphia 4: 19. (1848) |
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