Poa secunda subsp. juncifolia var. juncifolia (Scribn.) 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

Poa secunda subsp. juncifolia var. juncifolia (Scribn.) Soreng, comb. et stat nov. Fig. 4B.

Basionym.

Poa juncifolia Scribn., Bull. Div. Agrostol., U.S.D.A. 11: 52, pl. 8, 1898.

Synonyms.

Poa brachyglossa Piper, P. fendleriana var. juncifolia (Scribn.) M.E. Jones, P. juncifolia Scribn., P. juncifolia subsp. juncifolia , P. juncifolia subsp. porteri D.D. Keck (?), P. nevadensis var. juncifolia (Scribn.) Beetle.

Notes.

The type and other material identified as Poa juncifolia subsp. porteri by Keck combine pubescent lemmas with narrow panicles, firm blades and short ligules on lateral shoots and appear to RJS to be intermediate in form between varieties juncifolia and secunda ( canbyi form).

Habitat and range.

Pine forests and steppe, riparian and alkali meadows, in well-drained to poorly-drained, light to heavy, often alkaline or saline soils. Range of the subspecies (Fig. 2B ), but infrequent in the California Floristic Province and south-western states.

Chromosome numbers.

Numbers reported as P. juncifolia : 2 n = 42, 60, 62, 63, 63-64, 78, 84. The one 2 n = 42 count was originally published by Hartung (1946) as P. cusickii , but RJS re-determined the California voucher as P. secunda subsp. juncifolia var. juncifolia .

Figures

Figure 2. Distribution of Poa secunda subspecies in North America: subsp. secunda (yellow); subsp. juncifolia (blue).

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).