Lagopsis darwiniana Pjak

First published in Kew Bull. 62: 109 (2007)
This species is accepted
The native range of this species is Mongolia. It is a perennial and grows primarily in the temperate biome.

Descriptions

Pyak, A., Shaw, S., Ebel, A. et al. (2007). A New Species of Lagopsis (Lamiaceae) from Mongolia. Kew Bulletin, 62(1), 107-111. Retrieved from http://www.jstor.org/stable/20443319

Type
Mongolia, Hovd aimag, inter jugi Jargalant Hayrhan et Boombat Hayrhan, 1641 m, 47°23'26.5", 093°12'40.5"", 19 June 2004, A. I. Pyak s.n. (holotypus TK!, isotypi NS!).
Morphology General Habit
Perennial herb, 20 - 30 cm high with a tap-root 20 - 25 cm long
Morphology Branches
Usually much branched from the base, less frequently (in small specimens) unbranched; prostrate or ascending
Morphology Stem
Stems covered with long, thin, flexuous, white hairs that are particularly dense under the inflorescence
Morphology Leaves
Leaves 2 - 3.5 cm long, 2.5 - 4 cm wide; lower ovate in outline, cordate at base, superficially palmate-dissected with ovate to rhombic lobes, deep cut or obtuse- or round-dentate, sparsely covered on both sides with thin matted hairs or lower surface almost glabrous but with numerous small sessile glands, petioles 7- 8 cm; upper leaves smaller, cordate or rhombic in outline, with three ovate, dissected lobes, on petioles 1 - 1.5 cm long
Morphology Reproductive morphology Inflorescences
Verticillasters many flowered in densely lanate, oblong spikes 3 - 5 cm long, sometimes the 2 or 3 at the base more widely spaced
Morphology Reproductive morphology Inflorescences Bracts
Bracts like upper leaves
Morphology Reproductive morphology Inflorescences Bracteoles
Bracteoles awl- or needle-shaped, rigid, 4- 6 mm long, densely covered in thin, long pink hairs
Morphology Reproductive morphology Flowers Calyx
Calyx similarly pubescent, tubular-campanulate, 5.0 - 5.3 mm long (excluding teeth); teeth 5 subequal (2 slightly longer), triangular, acuminate with long, sharp, awl-shaped tips, reflexed at flowering, almost equal in length to the calyx tube (4.8 - 5.0 mm)
Morphology Reproductive morphology Flowers Corolla
Corolla c. 5 mm long, bright yellow, slightly shorter than the calyx; corolla tube narrow, slightly curved, throat covered with short hairs, more dense close to the upper lobe; corolla lobes of similar size, 1/4 to 1/3 the length of the corolla tube; upper lobe entire, broad-ovate, the lower 3-lobed and the two lateral ones rounded
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens didynamous; short filaments c. 1 mm long, long filaments almost twice as long; all filaments ± glabrous but shortly pubescent at the base; anthers included
Morphology Reproductive morphology Flowers Gynoecium Style
Style as long as or shorter than the stamens, included
Morphology Reproductive morphology Fruits
Nutlets smooth, brownish, triquetrous, ovoid, 2.3 mm long, 1.5 mm wide.
Phenology
Flowers June -July, fruits July - Aug.
Distribution
Western Mongolia.
Ecology
Grows on dry stream beds, on gravel areas beside rivers, stony slopes and scree; altitudinal range 1600 - 2700 m. Although the surface of these sites becomes extremely dry during summer, the rocky soil in which the plant is rooted remains moist. Lagopsis darwiniana mainly grows in little vegetated sites and cannot be readily assigned to a particular plant community. Species found in the same gravel habitats and sometimes occurring with L. darwiniana include Dracocephalum origanoides Steph. ex Willd., Bupleurum mongolicum V. M. Vinogr., Scutellaria grandiflora Sims, Stenocoelium athamantoides (M. Bieb.) Ledeb., Astragalus changaicus Sancz. ex N. Ulziykh., Oxytropis heterophylla Bunge, Trifolium eximium Steph. ex DC., Minuartia verna (L.) Hiern, Plantago komarovii Pavlov, Androsace fedtschenkoi Ovcz., Valeriana petrophila Bunge, Potentilla exuta Soják, Potentilla aphanes Soják, Dichodon cerastoides (L.) Reichb., Veronica ciliata Fisch., Leiospora exscapa (C. A. Mey.) Dvorak, Clausia aprica (Steph.) Korn.-Trotzky.
Conservation
Using the criteria set out by IUCN (2001), this species has been assessed as Vulnerable (VU D2). It is widespread but sparsely distributed as isolated plants or in small groups of 10 - 15 specimens, restricted to a limited area of probably around 150 km2 within the 900 km2 of the Jargalant Hayrhan mountain range. Currently the species is known from only 4 - 5 locations, all of which are outside any protected area. However, it is apparently not immediately at risk. Sites are little grazed, but because of its low density and restricted distribution the plant is vulnerable to climatic factors such as depth of snow cover, joint impacts of freezing and thawing on the amount and the stability of habitat, and summer drought. Special conservation measures are probably not necessary in the short term but ultimately we would like to see monitoring of populations and ex situ conservation of seed and/or plants.
Note
Lagopsis darwiniana is so named in honour of the Darwin Initiative grant programme which provided the funding for the expedition during which the species was recognised.
[KBu]

Sources

  • Kew Backbone Distributions

    • The International Plant Names Index and World Checklist of Vascular Plants 2022. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2022 World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0
  • Kew Bulletin

    • Kew Bulletin
    • http://creativecommons.org/licenses/by-nc-sa/3.0
  • Kew Names and Taxonomic Backbone

    • The International Plant Names Index and World Checklist of Vascular Plants 2022. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2022 International Plant Names Index and World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0