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80e. Poa albertii subsp. lahulensis (Bor) Olonova & G. Zhu, Fl. China. 22: 309. 2006.

拉哈尔早熟禾 la ha er zao shu he

Basionym: Poa lahulensis Bor, Kew Bull. [3] 1948: 138. 1948; P. borealitibetica C. Ling.

Culms 10–20 cm tall, nodes 1 or 2. Leaf blade flat or folded, quite soft, 3–5 cm × 1.5–2.5 mm, both surfaces scabrid, frequently withering; ligule 1–3 mm. Panicle elliptic, 4–6 × 1.5–3 cm, branches 2 or 3 per node. Spikelets obovate, green or slightly tinged with purple, 4.5–6 mm, florets 3–6; glumes broadly lanceolate; lemma oblong-lanceolate, slightly membranous, keel and marginal veins densely pubescent below middle, areas between veins proximally pubescent; callus glabrous or minutely hairy.

Alpine grasslands; 2000–5500 m. Xizang, Yunnan [India].

The types of both Poa lahulensis and P. borealitibetica differ from other members of this complex by being more mesomorphic and look like dwarf plants of P. versicolor subsp. relaxa, with leaf blades softer and withering with age, panicles lax, and spikelets larger. The pubescence between the veins can vary, as far as complete absence, but other characters are quite constant. This might be evidence of the contribution of P. versicolor subsp. relaxa to the genotype of P. albertii subsp. lahulensis. More research is needed to find out the relationships and parentage of the subspecies of P. albertii, since subsp. lahulensis might not be of hybrid orgin but instead a direct derivate of P. versicolor subsp. relaxa.


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