Yucca baccata subsp. thornberi
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Yucca baccata subsp. thornberi |
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| Yucca baccata subsp. thornberi | ||||||||||||
| ( McKelvey ) Hochstätter |
Yucca baccata subsp. thornberi (English common name : Thornber's Yucca) is a subspecies of the blue palm lily ( Yucca baccata ) in the asparagus family (Asparagaceae).
description
Yucca baccata subsp. thornberi is stem-forming and forms several stems with a height of 0.5 to 1.5 meters. The variable green leaves are 0.5 to 1 meter long, 1 to 4 centimeters wide and form fibers on the leaf edges.
The short, upright or inclined to the side, branched, dense inflorescence that begins between the leaves is 1 to 1.2 meters high and protrudes above the leaves. The pendulous, elongated, flowers are 7 to 12 centimeters long and 1 to 3 centimeters in diameter. The six bracts are white to cream-colored. The flowering period extends from April to May.
Occurrence
Yucca baccata subsp. thornberi is widespread in the Sonoran Desert in Arizona on plains or flat rocky slopes in grasslands and sagebrush colonies at altitudes between 1000 and 1500 meters and often grows in association with various species of cacti .
When dry, it is frost-hardy in Colorado to minus 18 ° C.
Systematics
It is a representative of the Yucca series Baccatae section . The subspecies Yucca baccata subsp. In contrast to the subspecies Yucca baccata subsp. baccata trunk-forming. The species Yucca baccata is closely related to Yucca arizonica .
The botanical name honors the American botanist John James Thornber . The valid description is by Fritz Hochstätter under the name Yucca baccata subsp. thornberi was published in 2001.
Synonyms are Yucca thornberi McKelvey 1935 and Yucca baccata var. Brevifolia L.D.Benson & RADarrow 1943.
photos
Yucca baccata subsp. thornberi :
In May in Arizona
Group with inflorescences
Individual evidence
- ↑ Succulenta 80 (4): 166-173. 2001.
- ^ Journal Arnold Arboretum 16: 268, 1935.
- ↑ Amer. J. Bot. 30: 234. 1943.
literature
- Yucca baccata subsp. thornberi . In: Fritz Hochstätter (Ed.): Yucca (Agavaceae) . Volume 2 USA, Selbstverlag, 2002, pp. 32–33, photo material pp. 121–125, first description pp. 246–250, p. 306, ISBN 3-00-009008-8 .