Comments
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fornecido por eFloras
Hypericum przewalskii is closely related to H. ascyron, differing from it essentially by the obtuse to retuse leaf apex and usually 2-lined mature stem internodes. Hypericum macrosepalum seems to be aberrant in having more persistently 4-angled internodes, but is otherwise typical of forms with leaflike sepals in fruit. Hypericum pedunculatum typically has longer, narrower leaves and is more branched than typical H. przewalskii, but there is a complete intergradation between it and the typical form.
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- Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
Description
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Inglês
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fornecido por eFloras
Herbs, perennial, (0.17-)0.3-0.55 m tall, erect or sometimes ascending at base; stems few to numerous, simple or usually branched below inflorescence or throughout. Stems incompletely 4-lined or 2-lined when young, nearly always soon becoming terete. Leaves sessile; blade broadly oblong or oblong-ovate to narrowly oblong or oblong-lanceolate (reduced in size down stem), 2-6.5(-8) × 1-3.2 cm, thickly papery, abaxially rather paler but not glaucous; laminar glands dense, unequal dots or short streaks; intramarginal glands dense; main lateral veins 4-6-paired, with densely reticulate tertiary venation not or scarcely prominent abaxially; base cordate-amplexicaul, apex rounded to shallowly retuse. Inflorescence 1-7-flowered from 1-3 nodes, flat-topped, sometimes with flowering branches from up to 5 nodes below, the whole then narrowly pyramidal to cylindric; bracts and bracteoles leaflike, ovate, entire, persistent. Flowers 2-4 cm in diam., stellate; buds nar- rowly ovoid to cylindric, apex obtuse to rounded. Sepals free or basally united, erect in bud, spreading to deflexed in fruit, subequal to unequal or rarely leaflike, narrowly or broadly oblong or elliptic to lanceolate or ovate-lanceolate or triangular-lanceolate, 8-10 × 2-4 mm, sometimes enlarging to 1.5 cm × 6.5(-8) mm in fruit; laminar glands rather sparse dots, distal and submarginal; marginal glands dense, small, margin undulate, apex rounded to obtuse or rarely short mucronate; veins (5-)7-9. Petals bright yellow, oblong-oblanceolate, 1.2-1.8 cm × 4-8 mm, 1.5-1.8 × as long as sepals; laminar glands lines, sometimes interrupted distally; marginal glands absent; margin entire; apiculus absent. Stamen fascicles each with 15-30 stamens, longest 1-2.4 cm, 0.85-1 × as long as petals. Ovary ovoid; styles 4.5-13 mm, 1-1.8 × as long as ovary, 0.5-0.9 united or appressed (when short); stigmas narrowly capitate. Capsule broadly to narrowly ovoid or subcylindric, 1.4-2.1 × (0.5-)0.7-1.4 cm, 1-2.1 × as long as sepals, apex obtuse. Seeds dark reddish brown to grayish brown, 1.3-1.5 mm, shallowly carinate, without terminal expansion; testa densely linear-reticulate. Fl. Jun-Aug, fr. Jul-Oct.
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- Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
Distribution
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Inglês
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fornecido por eFloras
Gansu, Henan, W Hubei, Qinghai, Shaanxi, Sichuan, N Yunnan.
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- cc-by-nc-sa-3.0
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- Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
Habitat
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Inglês
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fornecido por eFloras
● Mountain slopes, river bank thickets, meadows, roadsides; 2100-3400(-4000) m.
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- Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
Synonym
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Inglês
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fornecido por eFloras
Hypericum biondii R. Keller, p.p.; H. chinense Linnaeus var. minutum R. Keller; H. macrosepalum Rehder; H. obtusifolium R. Keller; H. pedunculatum R. Keller.
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- cc-by-nc-sa-3.0
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- Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
Hypericum przewalskii
(
Inglês
)
fornecido por wikipedia EN
Hypericum przewalskii, commonly called Przewalski's St. John's wort, is a flowering plant in Hypericum sect. Roscyna that is native to China.
Taxonomy
Hypericum przewalskii was first described by Karl Maximovich in the Bulletin de l'Academie Imperiale des Sciences de St-Petersbourg in 1881.[3] It is known as tu mai jin si tao in Chinese.[4] The species is most closely related to the one other species in sect. Roscyna, Hypericum ascyron, and is also closely related to Hypericum macrosepalum.[5]
Description
The species is a perennial herb that grows 3–5.5 cm (1.2–2.2 in) tall. It stands erect or sometimes ascends from a creeping base, with anywhere from a few stems to numerous. It is usually branched below the inflorescence or throughout the whole plant. The stems are 2-lined when young and become incompletely 4-lined or terete. The internodes are 25–80 mm (0.98–3.15 in) long and are all shorter than the leaves except the upper internodes which are very slightly longer. The leaves are directly attached and their blades are 20–65 mm (0.79–2.56 in) by 10–32 mm (0.39–1.26 in) and are oblong and get smaller down the stem. They are much paler in color beneath with a texture similar to paper. The apex of the blade is rounded and its base is cordate-amplexicaul. There are 4-6 pairs of main veins on the leaves from the lower half of the midrib, with the secondary and tertiary veins barely visible. The glands on the leaves are pale, dense, and consist of unequal dots or short streaks while the intramarginal glands are a pale shade. The species is 1-7 flowered from 1-3 different nodes and are organized in corymbs. The pedicels are 1.2–2.2 cm (0.47–0.87 in) long but can grow as long as 4.5 cm (1.8 in) long when the plant is in fruit. The flowers themselves are 2–4 cm (0.79–1.57 in) in diameter and are stellate. The buds are narrow and oval-shaped. The petals are bright yellow and are slightly curved and rounded. There are 5 stamen fascicles each with 15-30 stamens. The seeds are colored dark reddish-brown and are 1.3–1.5 mm (0.051–0.059 in) long. They are cylindric in shape and are shallowly carinate, without terminal expansion.[6][5]
The species flowers from June-August and fruits from July-October.[6]
Distribution and habitat
The species is native to China, specifically the north and central regions of the country in the provinces of Gansu, Shaanxi, Henan, Hubei, Sichuan, Yunnan, and Qinghai.[7] It is found on mountain slopes, thickets on river banks, in meadows and by roadsides at elevations of approximately 2,150–3,400 m (7,050–11,150 ft) above sea level.[6]
References
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- Wikipedia authors and editors
Hypericum przewalskii: Brief Summary
(
Inglês
)
fornecido por wikipedia EN
Hypericum przewalskii, commonly called Przewalski's St. John's wort, is a flowering plant in Hypericum sect. Roscyna that is native to China.
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- cc-by-sa-3.0
- direitos autorais
- Wikipedia authors and editors
突脉金丝桃
(
Chinês
)
fornecido por wikipedia 中文维基百科
二名法 Hypericum przewalskiiMaxim. 突脉金丝桃（学名：Hypericum przewalskii）为藤黄科金丝桃属下的一个种。
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突脉金丝桃: Brief Summary
(
Chinês
)
fornecido por wikipedia 中文维基百科
突脉金丝桃（学名：Hypericum przewalskii）为藤黄科金丝桃属下的一个种。
这是一篇與植物相關的小作品。你可以通过编辑或修订扩充其内容。 
