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bog bird's-foot lotus, bog bird's-foot trefoil, bog deervetch, meadow bird's-foot-trefoil, meadow deervetch, meadow or bog bird's-foot trefoil, pinnate lotus

Yolla Bolly Mountains. bird's-foot trefoil

Habit Herbs usually robust, 15–50 cm, glabrous; rhizomatous, rhizomes spongy-thickened, whitish, rooting at nodes. Herbs mat-forming, 5–15 cm, glabrate; taprooted and with caudex.
Stems

1–5, usually ascending, sometimes decumbent, unbranched or branched, ± fleshy or not.

1–30+, usually decumbent, sometimes ascending, branched, slender, not fleshy.

Leaves

stipules ovate, 2–5 mm, scarious; petiolate;

rachis straight, 2–7 cm;

leaflets 5–9(–11), petiolulate, blades usually elliptic to obovate, rarely oblanceolate, (7–)10–25 mm, apex emarginate or rounded to obtuse or acute, surfaces glabrous.

stipules ovate, inconspicuous, scarious; petiolate;

rachis straight, 0.7–1.5 cm;

leaflets 3–5(–7), petiolulate, blades obovate to oblanceolate, 3–10 mm, apex usually acute, sometimes obtuse, surfaces glabrous.

Peduncles

ascending, (1–)5–10 cm, longer than subtending leaf, elongating in fruit, glabrous;

bract subtending umbel or absent, 1(–3)-foliolate.

ascending or spreading, 2–3 cm, longer than subtending leaf, elongating in fruit;

bract subtending umbel, 1–3-foliolate.

Umbels

4–10-flowered.

1–3-flowered.

Flowers

10–15 mm;

calyx reddish, 5.5–7.5 mm, glabrous, tube obconic-cylindric, 4–5 mm, lobes abaxial 3 subulate to lanceolate, adaxial 2 triangular, 1–2 mm, usually eciliate, sometimes sparsely ciliate;

corolla banner and keel yellow, wings white or cream, wings longer than keel, claw longer than calyx tube, banner reflexed to 180°, keel apex subacute.

(7–)8–10 mm;

calyx color unknown, 5–6.5 mm, glabrous, tube obconic-cylindric, (1.5–)2–3 mm, lobes triangular to triangular-subulate, 0.5–1 mm, ± ciliolate;

corolla banner yellow, wings and keel whitish yellow, wings ± equaling keel, claw ± equaling calyx tube, banner erect, keel apex not known.

Legumes

± ascending to ± inclined, ± reddish to dark brown, linear-oblong, turgid, 30–50(–85) × 1.5–2.5 mm, thinly leathery, incompletely septate, glabrous.

erect, brown, narrowly oblong, laterally compressed, 18–25 × 1.5–2 mm, leathery, not septate, glabrous.

Seeds

8–20, olive to reddish or dark brown, oblong, 1.5 mm.

(2–)4–7, olive- to red-brown, oblong, 2–2.5 mm.

2n

= 14.

Hosackia pinnata

Hosackia yollabolliensis

Phenology Flowering spring–early summer. Flowering summer.
Habitat Wet to moist, open areas, springy meadows, bogs, wetlands, springs, streambeds, stream banks, seepages, in water, ditches. Open rocky, dry slopes, ridges, and summits, snowbeds and moist areas below, openings in red fir forests, moist gravelly or sandy areas, rocky loamy soils.
Elevation 30–2500 m. (100–8200 ft.) 1600–2200 m. (5200–7200 ft.)
Distribution
from FNA
CA; ID; OR; WA; BC
[WildflowerSearch map]
[BONAP county map]
from FNA
CA
[BONAP county map]
Discussion

Hosackia pinnata reaches its northern limit near Nanaimo, southeastern Vancouver Island, British Columbia (M. Donovan 2006). It ranges southward along the inner foothills of the coastal ranges (avoiding areas of high precipitation) and in the Cascade Range, to the Coast Ranges of California (to Santa Barbara County) and along the Sierra Nevada. Hosackia pinnata is sometimes disjunct inland to eastern Washington and northwestern Idaho and, rarely, in central Oregon.

Hosackia bicolor Douglas ex Bentham and Lotus bicolor Frye & Rigg are both superfluous, illegitimate names that pertain to H. pinnata.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Hosackia yollabolliensis is uncommon in the Yolla Bolly Mountains and South Fork Mountain of the North Coast Ranges in Humboldt and Trinity counties.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 11. FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Hosackia Fabaceae > subfam. Faboideae > Hosackia
Sibling taxa
H. alamosana, H. crassifolia, H. gracilis, H. incana, H. oblongifolia, H. rosea, H. stipularis, H. yollabolliensis
H. alamosana, H. crassifolia, H. gracilis, H. incana, H. oblongifolia, H. pinnata, H. rosea, H. stipularis
Synonyms Lotus pinnatus Lotus yollabolliensis
Name authority (Hooker) Abrams in L. Abrams and R. S. Ferris: Ill. Fl. Pacific States 2: 541. (1944) (Munz) D. D. Sokoloff: Kew Bull. 55: 1010. (2000)
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