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FOC | Family List | FOC Vol. 8 | Crassulaceae

5. Orostachys Fischer, Mém. Soc. Imp. Naturalistes Moscou. 2: 270. 1809.

瓦松属 wa song shu

Herbs biennial. Roots fibrous. Rhizome absent. Leaves of 1st year arranged in a solitary, basal, dense rosette, alternate, linear to ovate, often with dull purple dots, apex usually cuspidate with a white, cartilaginous appendage to rarely softly obtuse or acuminate. Flowering stem solitary, arising from center of rosette in 2nd year; stem leaves alternate. Inflorescense terminal, a dense raceme or thyrse, narrowly pyramidal to cylindric in outline, with a distinct main axis and sometimes cymose lateral branches, many flowered, bracteate. Flowers bisexual, subsessile or pedicellate, 5-merous. Sepals usually shorter than petals. Petals subconnate at base, white, pink, or red, lanceolate. Stamens 2 × as many as petals, in 2 series. Nectar scales small. Carpels erect, free, stipitate, many ovuled. Styles slender. Follicles beaked at apex, many seeded.

Thirteen species: China, Japan, Kazakhstan, Korea, Mongolia, Russia; eight species (one endemic) in China.

1 Apical spine of rosette leaves absent; bracts spatulate-ovate   1 O. malacophylla
+ Apical spine of rosette leaves cuspidate; bracts oblong to linear.   (2)
2 (1) Apical spine or appendage of rosette leaves not cartilaginous   2 O. japonica
+ Apical spine or appendage of rosette leaves cartilaginous.   (3)
3 (2) Rosette leaves apically fimbriate or spine 1-toothed on each side.   (4)
+ Rosette leaves apically fimbriate, sometimes ± undulate.   (5)
4 (3) Margin of rosette leaf appendage fimbriate; petals red or white   3 O. fimbriata
+ Margin of rosette leaf appendage entire, sometimes spine 1-toothed on each side; petals white   4 O. chanetii
5 (3) Petals yellowish green; pedicel ca. 1 mm or absent; anthers yellow   5 O. spinosa
+ Petals white, red, reddish, or petal apex reddening; pedicel conspicuous, rarely almost absent; anthers purple.   (6)
6 (5) Flowering stem 2-6 cm   6 O. minuta
+ Flowering stem 5-40 cm.   (7)
7 (6) Stamens slightly shorter than or equaling petals; bracts shorter than flowers, ovate-oblong   7 O. thyrsiflora
+ Stamens slightly shorter than petals; bracts equaling or longer than flowers, linear to lanceolate   8 O. cartilaginea

Lower Taxa


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