Comments
(
Inglês
)
fornecido por eFloras
The tetraploid chromosome number and apomictic development of polyembryonic seeds indicate that Spiranthes parksii is a member of the S. cernua complex. The broad petals with central green stripe, several veins (instead of the three typical of the group), and erose-emarginate apical margin furthermore evidently represent partial peloria. Peloria is common in S. cernua, especially in the prairies, although in most cases it involves the suppression of the lip rather than the elaboration of the petals to a condition approximating the lip, as is the case in S. parksii. With a very limited distribution in east-central Texas, S. parksii might therefore represent merely a local, minor form of S. cernua. Other characteristics, however, including the small flower size and often upturned lateral sepal apices, lie outside the normal range of variation in S. cernua and suggest that the plants represent a distinct species.
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- Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
Description
(
Inglês
)
fornecido por eFloras
Plants 15–33 cm. Roots few, spreading to descending, slender to somewhat tuberously thickened, mostly to 0.8 cm diam. Leaves fugaceous, basal, ascending to spreading, linear-lanceolate to somewhat broader. Spikes loosely spiraled, usually 5 flowers per cycle of spiral; rachis moderately to densely pubescent, some trichomes capitate, glands obviously stalked. Flowers horizontal to ascending, white to pale yellowish green, scarcely gaping, urceolate-tubular; sepals distinct to base, 5–8 mm; lateral sepals directed nearly forward, apex straight or apical 1–2 mm curved upward; petals whitish to yellow-green with longitudinal central green stripe, ovate, obovate, or suborbiculate, 4.5–6.7 mm, apex obtuse to emarginate-erose; lip centrally yellow to yellowish or greenish white, ovate to ovate-oblong, 5–7 × 3.8–4.9 mm, apex truncate, obtuse to deeply emarginate, erose-crisped, glabrous; veins several, branches parallel; basal calli incurved to elongate, prominent; viscidia linear-lanceolate; ovary 4–6 mm. Seeds partly or wholly polyembryonic. 2n = 60.
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- cc-by-nc-sa-3.0
- direitos autorais
- Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
Habitat
(
Inglês
)
fornecido por eFloras
Dry open to lightly shaded sites in post-oak savanna; of conservation concern; 100m.
- licença
- cc-by-nc-sa-3.0
- direitos autorais
- Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
Spiranthes parksii
(
Inglês
)
fornecido por wikipedia EN
Spiranthes parksii, the Navasota ladies' tresses,[3] is a species of orchid that is endemic to Texas, United States. The flower was first discovered in 1945 and was first described by Donovan Stewart Correll in his 1950 book, Native Orchids of North America North of Mexico.
Description
Spiranthes parksii is a slender-stemmed perennial, 8–15 inches (200–380 mm) tall. Leaves are long and thin and found mostly near the ground level, but usually disappear when the flower buds. Flowers petals are round or oval and off-white in color. The flowers typically spiral up the stem. Conspicuously white-tipped bracts occur underneath each 1⁄4-inch-long (6.4 mm) flower. The side petals have a green central stripe, and the lip (bottom petal) is distinctly ragged.
Habitat and range
Navasota ladies' tresses is primarily found in the East Central Texas forests, usually along creeks in the Brazos and Navasota River watersheds. In 1982, when the species was listed as endangered, only two populations were believed to exist, both in Brazos County. Since then, biologists have identified the species in Bastrop, Burleson, Fayette, Freestone, Grimes, Jasper, Leon, Madison, Milam, Robertson, and Washington Counties.[4] The population in Jasper County is disjunct and the only one that occurs in the Piney Woods.[5]
Conservation
Navasota ladies' tresses was listed as an endangered species by the United States Fish and Wildlife Service (USFWS) in May 1982. The decline of the plant is mostly due to loss of habitat from human encroachment and activity.[4]
References
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- direitos autorais
- Wikipedia authors and editors
Spiranthes parksii: Brief Summary
(
Inglês
)
fornecido por wikipedia EN
Spiranthes parksii, the Navasota ladies' tresses, is a species of orchid that is endemic to Texas, United States. The flower was first discovered in 1945 and was first described by Donovan Stewart Correll in his 1950 book, Native Orchids of North America North of Mexico.
- licença
- cc-by-sa-3.0
- direitos autorais
- Wikipedia authors and editors
Spiranthes parksii
(
Vietnamita
)
fornecido por wikipedia VI
Spiranthes parksii là một loài thực vật có hoa trong họ Lan. Loài này được Correll miêu tả khoa học đầu tiên năm 1947.[3]
Chú thích
Liên kết ngoài
- licença
- cc-by-sa-3.0
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- Wikipedia tác giả và biên tập viên
Spiranthes parksii: Brief Summary
(
Vietnamita
)
fornecido por wikipedia VI
Spiranthes parksii là một loài thực vật có hoa trong họ Lan. Loài này được Correll miêu tả khoa học đầu tiên năm 1947.
- licença
- cc-by-sa-3.0
- direitos autorais
- Wikipedia tác giả và biên tập viên
庭園綬草
(
Chinês
)
fornecido por wikipedia 中文维基百科
庭園綬草（学名：Spiranthes parksii）是蘭科綬草屬植物，是美国得克萨斯州的特有种，目前处於濒危状态。此物种最初是於1945年被首次发现，并在1950年被Donovan Stewart Correll在其著书《Native Orchids of North America North of Mexico》中首次描述。庭園綬草在1982年5月被美国鱼类及野生动物保护局（United States Fish and Wildlife Service）列入濒危物种，其数量的减少主要是因为人类入侵和其他人类活动造成其栖息地丧失。
特征
庭園綬草的茎细长，多年生，株高20－38厘米。叶修长，质薄，大多基生，当花蕾长出时一般会脱落。花瓣为圆形或卵形，纯白色，螺旋状盘绕茎，每枚花长约6毫米。苞片先端明显为白色，位於花的下方。花瓣中央有绿色条纹，唇瓣明显的凹凸不平。
生活环境
庭園綬草生长於得克萨斯中东部布拉索斯河及那瓦苏打河（Navasota River）流域的溪流边的森林和大草原上。1982年当此物种被列入濒危物种时，德克薩斯州布拉索斯縣的庭園綬草只剩下2个种群。自那时起，生物学家已确认在巴斯特罗普县、伯利森县、费耶特县、弗里斯通县、格赖姆斯县、杰斯帕县、莱昂县、麦迪逊县、米拉姆县、罗伯森县和华盛顿县有此物种。
参考文献
庭園綬草: Brief Summary
(
Chinês
)
fornecido por wikipedia 中文维基百科
庭園綬草（学名：Spiranthes parksii）是蘭科綬草屬植物，是美国得克萨斯州的特有种，目前处於濒危状态。此物种最初是於1945年被首次发现，并在1950年被Donovan Stewart Correll在其著书《Native Orchids of North America North of Mexico》中首次描述。庭園綬草在1982年5月被美国鱼类及野生动物保护局（United States Fish and Wildlife Service）列入濒危物种，其数量的减少主要是因为人类入侵和其他人类活动造成其栖息地丧失。
