Micranthes ferruginea |
Micranthes micranthidifolia |
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Alaska saxifrage, rusty hair saxifrage, rusty saxifrage |
branch-lettuce, lettuceleaf saxifrage |
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Habit | Plants solitary or tufted, with bulbils on caudices, short-rhizomatous. | Plants solitary or in groups, with bulbils on caudices. |
Leaves | basal; petiole indistinct, flattened, to 2 cm; blade spatulate to oblanceolate, 1–8(–10) cm, ± fleshy, base cuneate, margins irregularly serrate (usually with fewer than 12 coarse teeth), ciliate, surfaces hairy. |
basal; petiole ± indistinct, (broad), flattened, 3–15 cm; blade lanceolate to oblanceolate, 4–35 cm, thin, base attenuate, margins irregularly serrate to dentate, ciliate, surfaces sparsely hairy. |
Inflorescences | 20–30+-flowered, (flowers sometimes replaced ± completely by bulbils, or bulbils sometimes absent), open, lax thyrses, 10–40 cm, moderately to ± densely purple stipitate-glandular; (bracts reduced). |
(30–)50+–flowered, very open, lax thyrses, 30–75 cm, pink- to purplish-tipped stipitate-glandular; (bracts gradually smaller distally). |
Flowers | ± bilaterally symmetric; sepals reflexed, ovate to oblong; petals white, 3 with 2 basal yellow spots, 2 without spots, elliptic to oblanceolate, clawed, 3–5 mm, longer than sepals; filaments linear, flattened; pistils connate 1/2+ their lengths; ovary superior, (to 1/3 adnate to hypanthium). |
sepals strongly reflexed, oblong; petals white, with 2 basal yellow spots that sometimes appear as 1 (sometimes faded in dried material), ± elliptic to spatulate, clawed, 2–3 mm, longer than sepals; filaments strongly club-shaped; pistils distinct almost to base; ovary superior, (to 1/3 adnate to hypanthium). |
Capsules | green or yellow, sometimes purple tinged, or partly purple, valvate. |
green, sometimes purplish, folliclelike. |
2n | = 20. |
= 22. |
Micranthes ferruginea |
Micranthes micranthidifolia |
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Phenology | Flowering summer–early autumn. | Flowering spring. |
Habitat | Wet ledges, seepage slopes, stream banks | Rocky seepage slopes, stream banks |
Elevation | 10-2700 m (0-8900 ft) | 400-2100 m (1300-6900 ft) |
Distribution |
AK; CA; ID; MT; OR; WA; WY; AB; BC; NT
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GA; KY; MD; NC; PA; SC; VA; WV
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Discussion | Plants with bulbils replacing flowers are more common in the southern part (southern Alberta and British Columbia southwards) of the range of Micranthes ferruginea and have been called Saxifraga ferruginea var. macounii. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Micranthes micranthidifolia was formerly gathered by local people in the southern Appalachians as a spring “green” (hence the common name, “branch” being dialect for a small stream); it is still occasionally seen in local grocery stores. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 8, p. 58. | FNA vol. 8, p. 60. |
Parent taxa | Saxifragaceae > Micranthes | Saxifragaceae > Micranthes |
Sibling taxa | ||
Synonyms | Saxifraga ferruginea, Saxifraga ferruginea var. macounii, Saxifraga ferruginea var. newcombei, Saxifraga ferruginea var. vreelandii, Saxifraga newcombei | Robertsonia micranthidifolia, Aulaxis micranthidifolia, Saxifraga micranthidifolia |
Name authority | (Graham) Brouillet & Gornall: J. Bot. Res. Inst. Texas 1: 1020. 2007 , | (Haworth) Small: Fl. S.E. U.S., 501, 1331. 1903 , |
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