Muhlenbergia distichophylla (J. Presl) Kunth

Muhlenbergia distichophylla (Presl) Kunth, Rev. Gram. Suppl xvi. 1830.
Podosaemtim dislichophyllum Presl, Rel. Haenk. 1: 231. 1830.
Epicampes distichophylla Vasey. Cat. Grasses U. S. 45. 1885. (Based on "Muhlenbergia Munro"; also Ind. Kew. 3: 269. 1894, as synonym of Epicampes distichophylla Vasey. Name not effectively published. The species referred to is Muhlenbergia Emersleyi Vasey.) Epicampes slricla var. distichophylla Jones, Contr. West. Bot, 14: 6. 1912. (Based on Podosaemum distichophyllum Presl.)
Perennial; culms rather slender, glabrous, about 1 m. tall, the basal tuft of sheaths compressed-keeled; sheaths keeled, slightly scaberulous; ligule delicate, between firm slender auricles on either side, 1.5-2 cm. long; blades elongate, flat or folded, very scabrous, especially on the margins, 2-5 mm. wide, the apex long-attenuate; panicle narrow, soft and feathery, 30-40 cm. long, the axis angled, scabrous, the branches slender, ascending, approximate, naked below, many-flowered, 3-5 cm. long, or the lower as much as 10 cm. long; glumes scabrous, about 1 mm. long; lemma sparsely pilose and scaberulous, about 1.5 mm. long, the awn delicate, flexuous, scabrous, 1-1.5 cm. long.
Type locality: Mexico.
DisTRmuTiON: Rocky soil, Guerrero, Mexico (Langlassi607. 674).

Muhlenbergia angustifolia vSwallen, sp. nov
Perennial, rather slender; culms erect, glabrous or slightly scabrous, about one m. tall; sheaths compressed-keeled, scaberulous; ligule delicate, elongate; blades elongate, conduplicate below, about 1 mm. wide as folded (2 mm. when flattened), very scabrous on the margins, becoming revolute above, tapering into a long fine flexuous scabrous point; panicle erect, narrow, pale, 20-30 cm. long, the axis scabrous, the branches appressed or somewhat ascending, rather loosely imbricate, 1-3 cm. long, the lower sometimes longer ; .spikelets about 2.5 mm. long ; glumes equal, faintly scaberulous, rather obtuse; lemma about as long as or slightly longer than the glumes, acute, slightly scaberulous but not pubescent except slightly on the inner side at base; awn from just below the bifid apex, slender, flexuous, mostly 5-15 mm. long, sometimes shorter; palea nearly as long as the lemma. Perennis ; culmi erecti glabri vel scaberuli 1 m. alti ; vaginae compressae carinatae scaberulae; ligula hyalina elongata; laminae angustae elongatae, in parte inferiore conduplicatae, 1 mm. latae, marginibus scaberrimis, in parte superiore revolutae, apice sensim angustatae flexuosae scaberrimae; panicula angusta erecta pallida 20-30 cm. longa, ramis appressis 1-3 cm. longis; spiculae circa 2.5 mm. longae; glumae obtusiusculae; lemma glumas aequans acutura glabrum aristatum, arista flexuosa 5-15 mm. longa.
Type collected on rocky hills near Guadalajara. Mexico, November 11. 1889, Pringle 2346 (U. S.'Nat. Herb. no. 822882).

Muhlenbergia distichophylla là một loài thực vật có hoa trong họ Hòa thảo. Loài này được (J.Presl) Kunth mô tả khoa học đầu tiên năm 1833.