Micranthes hitchcockiana |
Micranthes pensylvanica |
Micranthes integrifolia |
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Hitchcock's saxifrage, Saddle Mountain saxifrage |
eastern swamp saxifrage, marsh, marsh saxifrage, Pennsylvania, Pennsylvania saxifrage, swamp saxifrage, swamp small-flower-saxifrage |
Columbian saxifrage, grassland saxifrage, northwestern saxifrage, smooth leaf saxifrage, swamp saxifrage, whole-leaf saxifrage |
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Habit | Plants solitary or in clumps, short-rhizomatous. | Plants solitary or in groups, with thick, fleshy rhizomes. | Plants solitary or in clumps, (sometimes gynodioecious), often with bulbils on caudices, or short-rhizomatous. |
Leaves | basal; petiole often indistinct, flattened, 5–50 mm; blade elliptic to obovate, 4–12 cm, slightly fleshy, base cuneate, margins serrate to dentate, densely ciliate, surfaces densely tangled-hairy. |
basal; petiole indistinct, flattened, 3–10 cm; blade linear or elliptic to ovate, 6–25 cm, fleshy, base attenuate, margins entire or subentire, ciliate, surfaces usually densely short-hairy, often tangled brown-hairy along proximal midveins. |
basal; petiole flattened, 0.5–4 cm; blade narrowly to broadly ovate, 2–7 cm, ± leathery, base attenuate, margins entire or minutely denticulate, usually ciliate, surfaces sparsely to moderately hairy. |
Inflorescences | 70+-flowered, open, lax, flat-topped thyrses, 15–35 cm, tangled, yellow-tipped stipitate-glandular. |
(30–)50+-flowered, open, often lax thyrses, 25–125 cm, purple-tipped stipitate-glandular. |
(15–)20+-flowered, open to ± congested, conic thyrses, (usually branched, lateral cymules ± open), 12–35 cm, densely pink- to purple-tipped stipitate-glandular. |
Flowers | sepals reflexed, elliptic to ovate; petals white, not spotted, elliptic, clawed, 2–5 mm, longer than sepals; filaments linear, flattened; pistils connate to 1/2 their lengths; ovary 1/2 inferior, appearing more superior in fruit. |
sepals reflexed, triangular to ovate; petals white to cream or rarely purple, not spotted, linear to narrowly elliptic, not clawed or slightly clawed, 2–3 mm, longer than sepals; filaments linear, flattened; pistils connate to 1/2 their lengths; ovary 1/2+ inferior, appearing superior in fruit. |
sepals spreading to slightly reflexed, ovate; petals white, not spotted, obovate, clawed, 2–4 mm, longer than sepals; filaments linear, flattened; pistils connate to 1/2 their lengths; ovary 1/2+ inferior. |
Capsules | greenish to reddish purple, folliclelike. |
green, folliclelike. |
reddish or purplish, folliclelike. |
2n | = 76. |
= 56, 84, 112. |
= 38. |
Micranthes hitchcockiana |
Micranthes pensylvanica |
Micranthes integrifolia |
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Phenology | Flowering late spring–summer. | Flowering spring. | Flowering late winter–spring. |
Habitat | Wet rocks and ledges on mountain-top balds | Marshy meadows, mucky seepages in woods, swamp forests, montane bogs and seeps | Vernally moist meadows, grassy slopes, rock outcrops |
Elevation | 600-1100 m (2000-3600 ft) | 100-1400 m (300-4600 ft) | 0-1800 m (0-5900 ft) |
Distribution |
OR
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CT; DE; IA; IL; IN; KY; MA; MD; ME; MI; MN; MO; NC; NH; NJ; NY; OH; PA; RI; TN; VA; VT; WI; WV; MB; ON; SK
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CA; OR; WA; BC
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Discussion | Of conservation concern. Micranthes hitchcockiana may have originated from hybridization between M. rufidula and M. oregana (P. E. Elvander 1984; W. E. Perkins 1978). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Purple-petalled populations of Micranthes pensylvanica have been known as Saxifraga purpuripetala and are found in Maine, New York, Pennsylvania, and Vermont. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
The occasional occurrence of sterile pollen has been noted in this as well as in other species of Micranthes (as Saxifraga, K. I. Beamish 1961). Some populations exhibit gynodioecism (P. E. Elvander 1982). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 8, p. 70. | FNA vol. 8, p. 67. | FNA vol. 8, p. 67. |
Parent taxa | Saxifragaceae > Micranthes | Saxifragaceae > Micranthes | Saxifragaceae > Micranthes |
Sibling taxa | |||
Synonyms | Saxifraga hitchcockiana | Saxifraga pensylvanica, M. pensylvanica var. purpuripetala, Saxifraga forbesii, Saxifraga pensylvanica var. forbesii, Saxifraga pensylvanica subsp. interior, Saxifraga pensylvanica var. purpuripetala, Saxifraga pensylvanica subsp. tenuirostrata, Saxifraga purpuripetala | Saxifraga integrifolia |
Name authority | (Elvander) Brouillet & Gornall: Novon 18: 138. 2008 , | (Linnaeus) Haworth: Saxifrag. Enum., 45. (1821) | (Hooker) Small: in N. L. Britton et al., N. Amer. Fl. 22: 137. 1905 , |
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