Biology:Hedinia tibetica
| Hedinia tibetica | |
|---|---|
Scientific classification 
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| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Rosids |
| Order: | Brassicales |
| Family: | Brassicaceae |
| Genus: | Hedinia Ostenf. |
| Species: | H. tibetica
|
| Binomial name | |
| Hedinia tibetica (Thomson) Ostenf.
| |
| Synonyms[1] | |
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Hedinia is a monotypic genus of flowering plants belonging to the family Brassicaceae.[2] It only contains one known species, Hedinia tibetica.[1]
Description
They are annual herbaceous plants, 5–30 cm (2–12 in) tall, with green stems which are procumbent (trailing) or ascending, they are densely hirsute (very hairy) with simple trichomes to 1.3 mm. The basal leaves are sparsely to densely pubescent, with a petiole (a leaf stalk supporting a blade) measuring 0.5–2 cm (0–1 in) long. They are ciliate (with a fringe of marginal hairs). The leaf blades are ovate or narrowly oblong in outline, 1- or 2-pinnatisect (cut to the mid-rib), 1–4 cm (0–2 in) long and 0.7–2 cm (0–1 in) wide. The cauline leaves (on an aerial stems) are similar to the basal leaves, are reduced in size with divisions toward stem apex. The racemes (flower spikes) are bracteate throughout or rarely only basally. The distal (furthest) bracts are subsessile (having a very small stalk), sometimes adnate (grown from or closely fused) to the pedicel (stalk of a flower). The fruiting pedicel is straight, erect or ascending, 1.5–3.5 mm (0–0 in) long. The sepals are oblong shaped, 1.3–2 mm (0–0 in) long and 0.7–0.9 mm (0–0 in) wide. The petals are obovate shaped, 2–3.2 mm (0–0 in) long and 0.9–1.4 mm (0–0 in) wide, with a claw (narrow part) 1.5 mm. The filaments (stalk of a stamen) are 1.5–2 mm (0–0 in) long. The anthers are 0.3–0.4 mm (0–0 in) long with 20-46 ovules per ovary. The fruit (or seed capsule) is broadly oblong, rarely oblong-linear or suborbicular in shape. They are 5–10 mm (0–0 in) long and 3-5 mm wide. They are flat or slightly twisted, obtuse, slightly retuse (blunt ended), or rarely subacute at both ends. The valves are glabrous (hairless) or pubescent. The style is 0.3-0.8 mm. The seeds are light to dark brown in colour, oblong shaped, 0.8-1.1 long and 0.4-0.6 mm wide. They bloom between June and August, and fruiting between July-September.[3][4]
Taxonomy
The genus name of Hedinia is in honour of Sven Hedin (1865–1952), a Swedish geographer, topographer, explorer, photographer, travel writer and illustrator.[5] The Latin specific epithet of tibetica refers to Tibet, where the original plants were found.
It was first described and published in S.Hedin (edited), Southern Tibet (S. Tibet) Vol.6 Issue 3 on page 77 in 1922.[1]
Range and habitat
Its native range is from Central Asia to China and the Himalayas. It is found in the regions of China (in Qinghai and Xinjiang), East and West Himalayas, Kyrgyzstan, Nepal, Tadzhikistan and Tibet.[1]
It grows in sandstone gravel, on alpine meadows, steppe, scree and sandy slopes. They can be found at an altitude of 3,900–5,800 metres (12,800–19,000 ft) above sea level.[3][6] Including on the semi-shrub deserts of the upper slopes of the Qinghai-Xizang Plateau,[7] and the Tibetan Plateau.[8]
References
- ↑ 1.0 1.1 1.2 1.3 "Hedinia tibetica" (in en). Royal Botanic Gardens, Kew. http://www.plantsoftheworldonline.org/taxon/284575-1.
- ↑ Al-Shehbaz, Ihsan A.; Warwick, Suzanne I. (July 2006). "A Synopsis of Smelowskia (Brassicaceae)". Harvard Papers in Botany 11 (1): 91–99. doi:10.3100/1043-4534(2006)11[91:ASOSB2.0.CO;2].
- ↑ 3.0 3.1 "Hedinia tibetica in Flora of China @ efloras.org". http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=200009555.
- ↑ Dvorský, Miroslav; Klimeš, Leoš; Doležal, Jiří; Wild, Jan; Dickoré, Bernhard W. (2018). A field guide to the flora of Ladakh (1st ed.). Praha. pp. 100. ISBN 978-80-200-2826-6. OCLC 1038797341. https://www.worldcat.org/oclc/1038797341.
- ↑ Quattrocchi, Umberto (2000). CRC World Dictionary of Plant Names, Volume II, D–L. Boca Raton, Florida: CRC Press. ISBN 978-0-8493-2676-9.
- ↑ Macek, Martin; Dvorský, Miroslav; Kopecký, Martin; Wild, Jan; Doležal, Jiří (25 August 2021). "Elevational range size patterns of vascular plants in the Himalaya contradict Rapoport's rule" (in en). Journal of Ecology 109 (12): 4025–4037. doi:10.1111/1365-2745.13772. ISSN 0022-0477. https://onlinelibrary.wiley.com/doi/10.1111/1365-2745.13772.
- ↑ De-Yuan Hong and Stephen Blackmore (Editors) The Plants of China (2015), p. 146, at Google Books
- ↑ Du Zheng, Qingsong Zhang and Shaohong Wu (Editors) Mountain Geoecology and Sustainable Development of the Tibetan Plateau (2000), p. 451, at Google Books
Other sources
- Sven Anders Hedin, Southern Tibet; Discoveries in Former Times Compared with My Own Researches in 1906-1908, Volume 6, Part 3
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