Hedinia tibetica
Scientific classification Edit this classification
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]
  • Bursa tibetica Kuntze
  • Capsella thomsonii Hook.f.
  • Hedinia rotundata Z.X.An
  • Hedinia taxkargannica G.L.Zhou & Z.X.An
  • Hedinia taxkargannica var. hejigensis G.L.Zhou & Z.X.An
  • Hutchinsia tibetica Thomson
  • Smelowskia tibetica (Thomson) Lipsky

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. 1 2 3 4 "Hedinia tibetica". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 23 September 2021.
  2. ↑ 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:ASOSB]2.0.CO;2. S2CID 85823523.
  3. 1 2 "Hedinia tibetica in Flora of China @ efloras.org". www.efloras.org. Retrieved 26 September 2021.
  4. ↑ Dvorský, Miroslav; Klimeš, Leoš; Doležal, Jiří; Wild, Jan; Dickoré, Bernhard W. (2018). A field guide to the flora of Ladakh (1st ed.). Praha. p. 100. ISBN 978-80-200-2826-6. OCLC 1038797341.{{cite book}}: CS1 maint: location missing publisher (link)
  5. ↑ Quattrocchi, Umberto (2000). CRC World Dictionary of Plant Names, Volume II, D–L. Boca Raton, Florida: CRC Press. ISBN 978-0-8493-2676-9.
  6. ↑ 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". Journal of Ecology. 109 (12): 4025–4037. doi:10.1111/1365-2745.13772. ISSN 0022-0477. S2CID 238723656.
  7. ↑ De-Yuan Hong and Stephen Blackmore (Editors) The Plants of China (2015), p. 146, at Google Books
  8. ↑ 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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