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FOC | Family List | FOC Vol. 8 | Saxifragaceae | Saxifraga

1. Saxifraga sect. Micranthes (Haworth) D. Don, Trans. Linn. Soc. London, Bot. 13: 345. 1822.

小花组 xiao hua zu

Micranthes Haworth, Syn. Pl. Succ. 320. 1812.

Herbs perennial, usually evergreen. Rhizomes short, slender or thick, scaly, fibrous rooted. Stem cespitose or simple. Leaves alternate, all basal in rosettes, distinctly petiolate or tapered at base into a broad, indistinct petiole; leaf blade often carnose or leathery, margin often crenate, serrate, or dentate, rarely entire; hydathodes set in leaf margin, equidistant between abaxial and adaxial surfaces, not secreting chalk; foliar crystals present as druses. Flowering stem scapose, sometimes with leaflike bracts; inflorescence cymose, either lax or often much congested and restricted to apex of stem, usually several flowered. Flowers bisexual, usually actinomorphic. Sepals 5. Petals 5(or 7 or 8), usually white, rarely purplish, sometimes with yellow, orange, or purple spots. Stamens 10; filaments linear, subulate, or clavate; pollen 2-nucleate; exine tectum reticulate. Carpels 2, ovuliferous part united only at base or for up to 1/2 its length; styles free; nectary a band or fleshy disc adnate to and encircling base of ovary; ovary superior to more than 1/2 inferior, markedly expanding in fruit; integument 1. Fruit follicular (when carpels united only at base and placentation marginal) or a 2-loculed capsule (when ovuliferous portions united for up to 1/2 their length and placentation axile proximally and marginal distally), often inflated, dehiscing to middle or base. Seeds many, ellipsoid to fusiform, with longitudinal, ribbonlike, undulating or distinctly pectinate ribs, occasionally ribs indistinct or absent.

About 70 species: Asia, Europe, North America, mainly in montane areas; 13 species (six endemic) in China.

1 Stamen filaments clavate.   (2)
+ Stamen filaments linear or subulate.   (7)
2 (1) Leaves reniform to cordate; petiole slender, radially symmetric.   (3)
+ Leaves cuneate to truncate; petiole broad, flattened.   (4)
3 (2) Stamens shorter than or equaling petals   1 S. nelsoniana
+ Stamens longer than petals   2 S. manchuriensis
4 (2) Basal leaves spatulate.   (5)
+ Basal leaves ovate to oblong-ovate.   (6)
5 (4) Plants at least 6 cm tall; inflorescence more than 7-flowered; carpels strongly divergent in fruit   3 S. davidii
+ Plants to 6 cm tall; inflorescence 2- or 3-flowered; carpels not strongly divergent in fruit   4 S. clavistaminea
6 (4) Inflorescence 4-13-flowered   5 S. pallida
+ Inflorescence 1- or 2-flowered, flower nodding if solitary   6 S. parvula
7 (1) Leaf blade glabrous on both surfaces, margin entire   8 S. dungbooi
+ Leaf blade glabrous or pubescent on both surfaces, margin crenate-dentate.   (8)
8 (7) Petals not overlapping, narrowly ovate, less than 1.8 mm wide.   (9)
+ Petals overlapping, ovate to broadly so, more than 1.8 mm wide.   (11)
9 (8) Inflorescence ± cylindric; petals red or purple   10 S. lumpuensis
+ Inflorescence corymbose; petals white or pink.   (10)
10 (9) Petals white or pink, 1-veined   11 S. zekoensis
+ Petals white, 3-veined   12 S. divaricata
11 (8) Ovary broadly ovoid, broader than long; petals white, rarely red or purple   7 S. melanocentra
+ Ovary ovoid, at least as long as broad; petals white, red, or purple.   (12)
12 (11) Inflorescence cylindric   9 S. atrata
+ Inflorescence ± corymbose.   (13)
13 (12) Basal leaf margin crenate-serrate, not coarsely toothed; sepals at least 2.9 mm   7 S. melanocentra
+ Basal leaf margin coarsely 5-8-toothed toward apex; sepals to 2.5 mm   13 S. laciniata

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