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FOC | Family List | FOC Vol. 15 | Primulaceae

7. Androsace Linnaeus, Sp. Pl. 1: 141. 1753.

点地梅属 dian di mei shu

Androsace erecta

Credit: Harvard University Herbaria

Herbs perennial, annual, or biennial, acaulescent, rarely caulescent with ascending or decumbent shoots from a caudex. Leaves forming a rosette, rarely alternate; rosettes solitary or clustered, forming lax mats or compact cushions. Inflorescences umbellate, rarely a solitary flower, with bracts. Flowers 5-merous, homostylous. Calyx campanulate to subglobose, shallowly to deeply lobed. Corolla white, pink, purple, or dark red, rarely yellow; tube usually ± inflated, ca. as long as to shorter than calyx; throat constricted; lobes entire or emarginate. Stamens included, inserted on corolla tube; filaments very short; anthers ovate, apex obtuse. Style not longer than corolla tube. Capsule subglobose, dehiscing nearly to base. Seeds few to many.

Approximately 100 species widely distributed in temperate regions of the northern hemisphere; 73 species native to China.

Key 1

1 Leaves crenate or shallowly lobed.   (2)
+ Leaves deeply lobed at least 1/2 way to center.   (10)
2 (1) Flowers and leaves arising in whorls on elongated stems   1 Androsace axillaris
+ Flowers and leaves not as above.   (3)
3 (2) Bracts leaflike, often dentate   5 Androsace rotundifolia
+ Bracts not leaflike, margin entire.   (4)
4 (3) Calyx parted nearly to base   12 Androsace umbellata
+ Calyx parted to middle or above.   (5)
5 (4) Base of leaf blade deeply cordate, sinus penetrating 1/4-1/2 length of leaves.   (6)
+ Base of leaf blade shallowly cordate, sinus penetrating ca. 1/4 or less length of leaves.   (8)
6 (5) Herbs annual; leaf blade 4-7 mm wide   14 Androsace gmelinii
+ Herbs perennial; leaf blade 3-7 cm wide.   (7)
7 (6) Plants with reddish hairs; corolla purple   4 Androsace croftii
+ Plants with white hairs; corolla white   13 Androsace henryi
8 (5) Scapes ca. as long as to slightly longer than leaves; pedicel ca. 1/2 as long as scapes, reflexed in fruit; leaves rust-colored pilose   17 Androsace kouytchensis
+ Scapes distinctly longer than leaves; pedicel ca. 1/5 as long as scapes or shorter, not recurved in fruit; leaves minutely strigillose or bristly.   (9)
9 (8) Leaf blade orbicular, subleathery; calyx parted to middle   15 Androsace paxiana
+ Leaf blade ovate, membranous, base cordate; calyx parted below middle   16 Androsace gracilis
10 (1) Plants ± cespitose; caudex with many dwarf shoots, encircled by petioles of old leaves.   (11)
+ Plants solitary or fasciculate, without branched caudex.   (12)
11 (10) Leaves palmately lobed to base, divided again, segments linear   10 Androsace alchemilloides
+ Leaves 3-5-lobed to middle   11 Androsace wilsoniana
12 (10) Plants flagellate.   (13)
+ Plants not flagellate.   (14)
13 (12) Stolons much longer than scapes, retrorse pubescent; leaves lobed below middle   2 Androsace cuscutiformis
+ Stolons ca. as long as scapes, ± spreading pubescent; leaves lobed to middle   3 Androsace geraniifolia
14 (12) Plants (at least petiole) usually with reddish hairs.   (15)
+ Plants with white hairs.   (16)
15 (14) Leaves strigillose, hairs less than 1 mm   4 Androsace croftii
+ Leaves hirsute, hairs 1-2 mm   6 Androsace medifissa
16 (14) Pedicel shorter than bracts; umbels compact, subcapitate   9 Androsace dissecta
+ Pedicel longer than bracts; umbels lax.   (17)
17 (16) Plants strigillose, short appressed pubescent; umbels 10-25-flowered; scapes erect, ca. 2 × as long as leaves   7 Androsace elatior
+ Plants pilose, with spreading long hairs; umbels 3-8-flowered; scapes diffuse, ca. as long as to slightly longer than leaves   8 Androsace gagnepainiana

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