Hosackia pinnata |
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bog deervetch |
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Habit | Plants low to moderately robust, 7–70 cm; rhizomatous. |
Stems | 1–10+, ascending or decumbent, often fistulose, occasionally branched near bases, distally usually with few or more numerous closely appressed, flattened trichomes. |
Leaves | 2–11 cm; leaflets 5–9, elliptic to obovate or oblanceolate, sometimes oval, 8–39 × 3–16 mm; margins eciliate or ciliate; tips emarginate or rounded to obtuse or acute; surfaces glabrous or occasionally with minute trichomes appressed to abaxial midribs; young leaflets sometimes heavily invested with minute flattened trichomes; petiolules 0.6–1.2 mm. |
Inflorescences | 3–10(11)-flowered, with flowers on one side or occasionally ± radially disposed; pedicels 0.5–1.5 mm. |
Peduncles | ascending, 2–17 cm, usually much ? subtending leaf; much elongating in fruit, often bearing a few scattered or sometimes copious closely appressed trichomes; bracts directly subtending umbels; simple, generally scale-like, scarious, rarely leaf-like, 2–3(4) mm, sometimes absent. |
Flowers | slightly nodding; (12)13–16 mm; calyces 6–8 mm, green or reddish, glabrous; tubes obconic-cylindric, 4–5 mm; lobes subulate to triangular, 1–3 mm, eciliate or sometimes sparsely ciliate; posterior pair of lobes and anterior 3 dissimilar in size; shape; and spacing; corollas broad; showy; claws conspicuously > calyx tubes; banners large and spreading, yellow to yellow-orange, sometimes with reddish blush or reddish veins; wings spreading widely, proximally pale yellowish, distally white, sometimes slightly pink; inner margins ± approximate, sometimes overlapping; keels up to 3 mm < wings, bright yellow throughout or proximally paler with brighter yellow tips. |
Fruits | ± inclined to declined; ± linear, 30–70 × 1.5–3 mm, dark brown to reddish. |
Seeds | few, oblong, 2–2.7 × 1–1.5 mm. |
Stipules | narrow, deltoid or ovate to ovate-lanceolate, 2.5–5 × 1.7–4; ± symmetric, scarious; margins entire; tips usually obtuse or acute. |
2n | =14. |
Hosackia pinnata |
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Distribution | |
Discussion | Wetlands, meadows, stream margins, bogs. Flowering Apr–Jul. 0–1200 m. Casc, CR, ECas, Sisk, WV. CA, ID, WA; north to British Columbia. Native. The similarity of H. pinnata to H. gracilis and their possible confusion is discussed under the latter species. The two species share an unusual type of minute trichome not seen among the other Oregon species of the genus. These trichomes (0.2–0.5 mm), which may be found on distal portions of stems and peduncles and on unexpanded leaflets, are strongly appressed, completely flat, and pointed at both ends. |
Source | Flora of Oregon, volume 2, page 685 Gerald Carr |
Sibling taxa | |
Synonyms | Lotus pinnatus |
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