Lasthenia californica |
Lasthenia glaberrima |
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slender goldfields |
smooth goldfields, smooth lasthenia |
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Habit | Plants annual, 5–30 cm; fibrous-rooted. | |
Stems | glabrous. |
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Leaves | linear, 8–60 × 0.5–4 mm; margins entire; tips blunt; surfaces glabrous. |
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Involucres | hemispheric or campanulate, 4–7 mm. |
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Ray florets | 5–12, inconspicuous; corollas 1–1.5 mm, yellow, included or slightly exceeding involucres. |
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Disc florets | 3–30; corollas 1–2 mm, yellow; lobes 4; stamens included; styles included. |
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Phyllaries | 6–20; ? united, triangular; lobes free; tips acute; surfaces glabrous or strigillose distally. |
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Fruits | 3–4 mm; black or grayish, strigillose, pappi of 5–10 fimbriate scales, 1–2 mm. |
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Heads | radiate; peduncles 0.5–15 cm; surfaces glabrous or minutely puberulent. |
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2n | =10. |
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Lasthenia californica |
Lasthenia glaberrima |
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Distribution | ||
Discussion | Wet meadows, marshy areas, ditches, vernal pools. Flowering May–Jul. 50–400 m. Col, Sisk, WV. CA, WA. Native. The short stamens and styles of Lasthenia glaberrima are indicative of a self-pollinating breeding system (Ornduff 1963, 1966). The leaf tips of L. glaberrima are often described as “blunt” (Chan & Ornduff 2006), but more than this, each blunt tip appears to consist of a small, specialized gland, perhaps functioning for water secretion. This structure is less obvious or absent in the leaves of other Oregon Lasthenia taxa. During growth early in the season, when submerged in water, the stem of L. glaberrima develops a brownish, wrinkled epidermis, in contrast to the smooth, green stem later produced aerially. |
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Source | Flora of Oregon, volume 2, page 300 Kenton Chambers |
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Sibling taxa | ||
Subordinate taxa | ||
Web links |
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