Saxifraga tricuspidata |
Saxifraga mertensiana |
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prickly saxifrage, saxifrage à trois dents, three-tooth saxifrage |
Merten's or wood or woodland saxifrage, Mertens' saxifrage, wood saxifrage, woodland saxifrage |
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Habit | Plants loosely mat-forming, (stems trailing), not stoloniferous, with elongate caudex or rhizomatous. | Plants solitary or in clumps, not stoloniferous, with caudex or short-rhizomatous. |
Leaves | cauline, (marcescent, crowded proximally); petiole absent; blade (often reddish), linear to cuneate, 1–3-lobed or -toothed apically (distal cauline unlobed), rarely all unlobed, (lobes long spinose-mucronate), 5–20 mm, leathery, margins entire, softly glandular-ciliate, (nonsecreting hydathodes present adaxially), apex acute, long spinose-mucronate, surfaces glabrous. |
basal and cauline, (basal persistent, cauline ± inconspicuous); petiole rounded, 2–20 mm; blade round to reniform, irregularly shallowly lobed, 20–80(–100) mm, thin, margins serrate, stipitate glandular-ciliate, apex obtuse to rounded, surfaces sparsely hairy. |
Inflorescences | 3–10-flowered cymes, 4–10(–24) cm, white to sparsely pink- to purple-tipped stipitate-glandular; bracts sessile. |
30+-flowered, open, much-branched thyrses, usually some or all flowers replaced by bulbils (sometimes bulbils absent), 15–40 cm, dark purple-tipped stipitate-glandular; bracts (± inconspicuous), petiolate or sessile. |
Flowers | sepals erect to ascending, (sometimes purplish), triangular-ovate, margins ± glandular-ciliate, surfaces white to purple-tipped stipitate-glandular; petals white to cream, proximally to distally yellow-, orange-, and red-spotted, elliptic to ovate, 4–7 mm, much longer than sepals; ovary superior. |
sepals reflexed (at least in fruit), ovate to elliptic, margins eciliate, surfaces sparsely stipitate-glandular or glabrous; petals white, not spotted, narrowly ovate to elliptic, (3–)4–6 mm, longer than sepals; filaments strongly club-shaped; ovary superior. |
2n | = 26. |
= 36, ca. 48, 50. |
Saxifraga tricuspidata |
Saxifraga mertensiana |
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Phenology | Flowering late spring–summer. | Flowering spring–summer. |
Habitat | Open sandy, gravelly, or rocky sites, forest openings, grassy slopes, rocky ridges, stony tundra | Moist to wet stream banks, mossy cliffs and slopes, waterfall spray zones |
Elevation | 0-3000 m (0-9800 ft) | 0-2500 m (0-8200 ft) |
Distribution |
AK; MI; AB; BC; LB; MB; NT; NU; ON; QC; SK; YT; Greenland
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AK; CA; ID; MT; OR; WA; AB; BC
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Discussion | The rare, entire-leaved form of Saxifraga tricuspidata can be confused with S. bronchialis; it has glandular-ciliate margins instead of stiffly hooked-ciliate ones. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Plants of Saxifraga mertensiana bear bulbils in the axils of basal leaves. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 8, p. 142. | FNA vol. 8, p. 146. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | S. mertensiana var. eastwoodiae | |
Name authority | Rotbøll: Skr. Kiøbenhavnske Selsk. Laerd. Elsk. 10: 446. 1770 (as 3cuspidata) , | Bongard: Mém. Acad. Imp. Sci. St.-Pétersbourg, Sér. 6, Sci. Math. 2: 141. 1832 , |
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