Agave shawii
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Agave shawii in San Vicente in Baja California |
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| Engelm. |
Agave shawii is a plant from the genus of the Agave ( agave ).
description
Agave shawii grows individually, forms a short to long trunk up to 2 m in height or forms large, compact groups. The ovoid to linear, fleshy, pointed, finely roughened, green to bluish, curved leaves that are thickened at the base are 20 to 50 cm long and 8 to 20 cm wide. The leaf margins are variably curved and serrated. The strong, brown to gray terminal mandrel is 2 to 4 cm long.
The paniculate, straight to slightly curved inflorescence is 3 to 5 m high. The yellow to reddish, broadly funnel-shaped flowers appear in the upper half of the inflorescence on variable branches and are 65 to 100 mm long.
The egg-shaped to elongated, dark brown, three-chambered capsule fruits are 5.5 to 6.5 cm long and up to 2.5 cm wide. The black, crescent-shaped to wedge-shaped seeds are up to 7 mm long.
The flowering period extends from December to May.
The chromosome number for both subspecies is 2n = 60.
Systematics and distribution
Agave shawii is common in Mexico in Baja California , near the coast and in the USA in California in sagebrush formations. It is associated with numerous succulent and cactus species.
The first description by George Engelmann was published in 1875. Some of the numerous synonyms of Agave shawii Engelm. are Agave orcuttiana Trel. (1912) and Agave pachyacantha Trel. (1912).
The following subspecies are distinguished:
- Agave shawii subsp. shawii : It occurs from southern California to Baja California.
- Agave shawii subsp. goldmaniana (Trel.) Gentry : It only occurs in Baja California.
Agave shawii is a member of the Umbelliflorae group . Due to the unique environmental conditions of the Pacific region, the forms vary in size, leaf structure and flowering time. The subspecies goldmaniana , which occurs in drier areas in southern Baja California, has longer, light green leaves and the inflorescence is more pyramidal towards the tip. It is closely related to Agave sebastiana .
proof
- August J. Spread: Agave shawii . In: The Agaves . The Cactus & Succulent Journal Yearbook, 1968, p. 75.
- Howard Scott Gentry: Agave shawii . In: Agaves of Continental North America . The University of Arizona Press, 1982, pp. 639-645.
- J. Thiede: Agave shawii . In: Urs Eggli (Hrsg.): Succulent lexicon. Monocotyledons . Eugen Ulmer, Stuttgart 2001, ISBN 3-8001-3662-7 , pp. 62 .
Individual evidence
- ↑ Agave shawii at Tropicos.org. In: IPCN Chromosome Reports . Missouri Botanical Garden, St. Louis
- ↑ In: Trans. Acad. Sci. St. Louis . Volume 3, 1875, p. 314.
- ↑ Urs Eggli (Ed.): Succulents Lexicon. Monocotyledons . Eugen Ulmer, Stuttgart 2001, ISBN 3-8001-3662-7 , pp. 62 .
- ↑ a b Rafaël Govaerts (Ed.): Agave. In: World Checklist of Selected Plant Families (WCSP) - The Board of Trustees of the Royal Botanic Gardens, Kew . Retrieved February 6, 2020.
