Micranthes texana |
Micranthes subapetala |
|
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Texas saxifrage |
Yellowstone saxifrage |
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Habit | Plants solitary or in clumps, with bulbils on caudices. | Plants solitary or in clumps, with bulbils on caudices. |
Leaves | basal; petiole flattened, 1–3 cm; blade broadly ovate to oblong, 1.5–3 cm, ± leathery, base ± abruptly attenuate, margins subentire to slightly crenate, eciliate, surfaces glabrate to sparsely hairy. |
basal; petiole usually indistinct, flattened, ca. 2 cm; blade ovate or elliptic to oblanceolate, 3–15 cm, fleshy, base cuneate, margins entire or minutely denticulate, ciliate, surfaces hairy. |
Inflorescences | 20+-flowered, branched, ± capitate thyrses, 10–15 cm, hairy, sometimes purple-tipped stipitate-glandular. |
30+-flowered, ± constricted (spikelike) to ± open thyrses, 20–75 cm, yellow- to pink- (rarely purplish-) tipped stipitate-glandular. |
Flowers | sepals erect, ovate; petals white, not spotted, ± obovate, clawed, 2–3.5 mm, ± equaling sepals; filaments linear, flattened; pistils 3+, connate to 1/2 their lengths; ovary 1/2+ inferior, appearing more superior in fruit. |
sepals reflexed, ovate; petals absent, sometimes 1–5, pink to purplish, not spotted, elliptic, clawed, 1–2 mm, shorter than sepals; filaments linear, flattened; pistils connate to 1/2 their lengths; ovary inferior. |
Capsules | reddish to purplish, valvate. |
dark purple, valvate. |
2n | = 76. |
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Micranthes texana |
Micranthes subapetala |
|
Phenology | Flowering late winter–spring. | Flowering summer. |
Habitat | Sandy flats, rocky, open, wooded areas, granite outcrops | Subalpine and alpine meadows, wet banks, ledges |
Elevation | 50-500 m (200-1600 ft) | 1200-3000 m (3900-9800 ft) |
Distribution |
AR; GA; KS; LA; MO; OK; TX |
ID; MT; WY
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Discussion | Although the species is usually distinctive, some populations of Micranthes subapetala in northern Wyoming appear more similar to M. hieraciifolia than to typical M. subapetala and may need to be re-evaluated. The distributional disjunction between the two taxa is about 1600 kilometers. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Source | FNA vol. 8, p. 68. | FNA vol. 8, p. 66. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | Saxifraga texana | Saxifraga subapetala, Saxifraga oregana var. subapetala, Saxifraga rydbergii |
Name authority | (Buckley) Small: Fl. S.E. U.S., 501. 1903 , | (E. E. Nelson) Small: in N. L. Britton et al., N. Amer. Fl. 22: 139. 1905 , |
Web links |