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Androsace lanuginosa

(Rock Jasmine)

Common Names

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Common Names in English:

Rock Jasmine

Description

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Family Primulaceae

Herbs perennial or annual , rarely suffruticose . Leaves alternate, opposite, or whorled , often all basal, simple , entire to lobed . Flowers solitary or in panicles, racemes , or umbels, usually with bracts, perfect , (4- or) 5(--9) -merous, often heterostylous (Primula) . Calyx persistent . Corolla gamopetalous, actinomorphic , rarely absent (Glaux) . Stamens as many as and opposite corolla lobes , ± epipetalous , occasionally with scalelike staminodes. Filaments free or connate into a tube at base . Ovary superior, rarely semi-inferior (Samolus), unilocular ; placentation free central; style simple; stigma inconspicuous, capitate. Fruit a capsule, dehiscing by valves , rarely circumscissile or indehiscent. Seeds many or few; embryo small, straight, surrounded by endosperm.

The family contains 22 genera and ca. 1000 species, occurring mainly in temperate and mountainous regions of the northern hemisphere. Twelve genera and 517 species are widely distributed throughout China, but are represented mostly in the S and W regions. The centers of diversity for Primula, Androsace, and Omphalogramma are W Sichuan, E Xizang, and NW Yunnan. Lysimachia is also highly developed in provinces S of the Chang Jiang, while Pomatosace is an endemic genus confined to a small area of NW Sichuan and Qinghai.

Many species of Primula and Androsace are cultivated for their attractive flowers as pot plants , in rock gardens, or in garden borders . Some species of Lysimachia are used medicinally. Cyclamen persicum Miller is frequently cultivated as a pot plant.[1]

Genus Androsace

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.[2]

Physical Description

Habit: Spreading

Flowers: Bloom Period: June, July, August. • Flower Color: White • Flower Conspicuous: Clusters of small, single form flowers highlighted with a red eyezone, and a light fragrance.

Size/Age/Growth

Growth Rate: Slow Growing • Size: Slow growth 2 to 4 inches tall, less than 1 foot wide.

Landscaping

Care: Follow a regular watering schedule during the first growing season to establish a deep, extensive root system . For a neat appearance , remove old foliage before new leaves emerge . Divide clumps every 2 to 3 years in early spring .

Biology

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Growth

Culture: Space 12-15" apart.

Soil: Minimum pH: 4.6 • Maximum pH: 6.0

Sunlight: Sun Exposure: Full sun

Moisture: Water Requirements: Water regularly, when top 3 in. of soil is dry.

Temperature: Heat Zones: High: 8 (>90 to 120 days) Low:1 (< 1 days) (map) • Cold Hardiness: High:8 (10 to 20 F) Low:5 (-20 to -10 F) (map)

Taxonomy

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Notes

An accepted name in the RHS Horticultural Database.

Similar Species

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Members of the genus Androsace

ZipcodeZoo has pages for 413 species, subspecies, varieties, forms, and cultivars in this genus. Here are just 100 of them:

A. acaulis · A. acrolasia · A. acuta · A. acuta acuta · A. acutifolia · A. adenocephala · A. adfinis · A. adfinis subsp. brigantiaca · A. adfinis subsp. puberula · A. affinis · A. aflatunensis · A. aizoon · A. akbaitalensis · A. akbajtalensis · A. alaica · A. alaschanica · A. alaschanica var. zadoensis · A. alaskana · A. alba · A. alban · A. albana · A. albertina · A. alchemilloides · A. alismoides · A. alpina (Rock Jasmine) · A. altaica · A. americana · A. amurensis · A. angrenica · A. angustifolia · A. apennina · A. apus · A. aquatica · A. arachnoidea · A. arctica · A. arctisibirica · A. aretia · A. aretioides · A. argentea · A. arguta · A. arizonica · A. armeniaca · A. armeniaca var. macrantha · A. articulata · A. asprella · A. aurata · A. axillaris · A. baikalensis · A. baltistanica · A. barbulata · A. bidentata · A. bisulca · A. bisulca var. aurata · A. bocconi · A. brachystegia · A. brahmaputrae · A. brevifolia · A. brevis (Rock Jasmine) · A. brigantiaca · A. britanica · A. bryoides · A. bryomorpha · A. bulleyana · A. bungeana · A. caduca · A. caespitosa · A. cana · A. cantabrica · A. capillaris · A. capitata · A. carinata · A. carnea (Rock Jasmine) · A. carnea alba · A. carnea brigantiaca · A. carnea L. ssp. brigantiaca (Jord. & Four.) I.K.Fergus. 'Alba' · A. carnea brigantiaca Myer's form · A. carnea laggeri · A. carnea laggeri 'Andorra' · A. carnea laggeri × carnea rosea · A. carnea rosea · A. carnea subsp. brigantiaca · A. carnea 'Val d'Eyne' · A. carnea var. halleri · A. carnea × mathildae · A. carnea × pyrenaica · A. carnosula · A. caucasica · A. centriberica · A. cernuiflora · A. chaixi · A. chaixii · A. chamaejasme (Sweet-Flower Rock-Jasmine) · A. chamaejasmeersonii (Anderson's Rockjasmine) · A. chamaejasme andersonii (Anderson's Rockjasmine) · A. chamaejasme carinata · A. chamaejasme subsp. andersonii (Anderson's Rockjasmine) · A. chamaejasme subsp. arctisibirica · A. chamaejasme subsp. carinata (Sweetflower Rockjasmine) · A. chamaejasme subsp. lehmanniana (Lehmann's Rockjasmine) · A. chamaejasme var. coronata

More Info

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Further Reading

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Notes

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Identifiers

Footnotes

  1. Qiming Hu & Sylvia Kelso "Primulaceae". in Flora of China Vol. 15 Page 39. Published by Science Press (Beijing) and Missouri Botanical Garden Press. Online at EFloras.org. [back]
  2. "Androsace". in Flora of China Vol. 15 Page 80. Published by Science Press (Beijing) and Missouri Botanical Garden Press. Online at EFloras.org. [back]
Last Revised: 7/2/2009