Poa secunda subsp. secunda var. gracillima (Vasey) Soreng, comb. et stat nov.

Soreng, Robert John & Gillespie, Lynn J., 2018, Poa secunda J. Presl (Poaceae): a modern summary of infraspecific taxonomy, chromosome numbers, related species and infrageneric placement based on DNA, PhytoKeys 110, pp. 101-121 : 111-112

Poa secunda subsp. secunda var. gracillima (Vasey) Soreng, comb. et stat nov. Fig. 4D

Basionym.

Poa gracillima Vasey, Contr. U.S. Natl. Herb. 1(8): 272, 1893.

Synonyms.

Poa gracillima var. gracillima , P. gracillima Vasey, P. invaginata Scribn. & T.A. Williams.

Habitat and range.

Open forests, moist cliffs and rocks and subalpine to alpine meadows, in well-drained acid soils that are consistently moist through the growing season of the variety. Pacific Northwest and northern California.

Chromosome numbers.

Numbers reported as P. gracillima : 2 n = 81, ≈ 81, ≈ 84, 86, ≈ 91.

Figures

Figure 4. Poa secunda infraspecies illustrations (reproduced from Hitchcock 1935): A P. s. var. ampla panicle and floret B P. s. var. juncifolia panicle and floret C P. s. var. nevadensis panicle and floret D P. s. var. gracillima habit, panicle and floret E P. s. var. scabrella habit, panicles, spikelet and floret F, G P. s. var. secunda habit, panicle and floret variations A, B, C = subsp. juncifolia D, E, F, G = subsp. secunda. Scale bar: 5 mm for florets, 10 mm for spikelet, 5 cm for habits and panicles (10 cm for E habit and panicles).