Saxifraga serpyllifolia |
Saxifraga nathorstii |
|
---|---|---|
thyme-leaf saxifrage |
east Greenland saxifrage |
|
Habit | Plants mat-forming, not stoloniferous, rhizomatous. | Plants loosely mat-forming, not stoloniferous, rhizomatous, from caudex. |
Leaves | basal and cauline, (cauline 1–4); petiole absent; blade linear (cauline) or oblong to oblanceolate or spatulate, unlobed, 2–8.5 mm, fleshy, margins (recurved), entire, eciliate, apex obtuse, not mucronate, surfaces glabrous or glabrate. |
cauline, (not imbricate), opposite (distalmost alternate); petiole absent; blade oblanceolate to elliptic, unlobed, 5–9 mm, fleshy, margins entire, ciliate, with 1(–3) lime-secreting hydathodes, apex obtuse, surfaces glabrous. |
Inflorescences | solitary flowers, 2–7 cm, sparsely to densely pink- to purple-tipped stipitate-glandular; bracts sessile. |
solitary flowers, sometimes 2-flowered cymes, ebracteate, 3–4 cm, glabrate. |
Flowers | sepals erect to spreading (reflexed in fruit, often purplish), broadly ovate to elliptic, margins eciliate or sometimes sparsely ciliate, surfaces glabrous; petals pale yellow, rarely purple, faded when dried, not spotted, elliptic to obovate, 4–8 mm, longer than sepals; ovary superior. |
sepals erect, ovate, margins ciliate, surfaces glabrous; petals salmon to flesh colored, sometimes red or orange, rarely yellow, sometimes violet tinged, not spotted, obovate to oblanceolate, 12–15 mm, longer than sepals; ovary to 1/4 inferior. |
2n | = 16 (Russia). |
= 52. |
Saxifraga serpyllifolia |
Saxifraga nathorstii |
|
Phenology | Flowering summer. | Flowering summer. |
Habitat | Moist to dry sandy areas, cliffs, gravelly ridges, scree, tundra | Arctic marshes, damp tundra, alluvial river beds, dessicated ponds, inland nunataks |
Elevation | 0-2200 m (0-7200 ft) | 0-1200 m (0-3900 ft) |
Distribution |
AK; NT; NU; YT; Asia (Japan, Siberia) |
Greenland |
Discussion | The purple-flowered variant of Saxifraga serpyllifolia has been called var. purpurea. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Saxifraga nathorstii is known only from northeastern Greenland. T. W. Böcher (1941) showed cytologically that this species may be an allopolyploid that originated as a hybrid between S. oppositifolia and S. aizoides; morpho-logically, phenologically, and ecologically, it is intermediate between the two species (see also T. J. Sørensen 1933). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 8, p. 139. | FNA vol. 8, p. 136. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | S. serpyllifolia var. purpurea | S. oppositifolia var. nathorstii |
Name authority | Pursh: Fl. Amer. Sept. 1: 310. 1813 , | (Dusén) Hayek: Denkschr. Kaiserl. Akad. Wiss., Wein. Math.-Naturwiss. Kl. 77: 661. 1905 (as nathorsti), |
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