Disakisperma dubium (Kunth) P. M. Peterson & N. Snow

Leptochloa dubia (H.B.K.) Nees, Syll. PI. Nov. 1:4. 1824
Chloris dubia H.B.K. Nov. Gen. & Sp. 1: 169. 1816.
I.eptoslachys dubia G. Meyer, Fl. Esscq. 74. 1818. (Based on Chloris dubia H.B.K.)
Festuca oblusijlora Willd.; Spreng. Syst. 1: 356. 1825. (Type from Mexico.)
Schismus palens l'resl,Re.Haen]i. I: 269. 1830. (Type from Chile, Haenie.)
Leptochloa patens Kuntli.Rtv. Cram. Supp.XXll. 1830. (Hiised on Schismus patens VrQs.)
Diplachne patens Desv. in C. Gay. Hist. Chile Bot. 6; 371. 1853. (Based on .Schismus patens Pr:sl.)
Uralepis brevicuspidala Buckl. Proc. Acad. IMiila. 1862; 93. 1862. (Type from Texas, Wright 767.)
Ipnum mendocinum I'hilippi, Anal. Univ. Chile 36; 211. 1870. (Type from Mundo/.a, Argenluia.)
Diplachne dubia Scribn. Bull. Torrey Club 10; 30. 1K83. (Based on Leptochloa dubia Ntcs.)
Leptochloa PringUi Bcal, Grasses N. Am. 2: 436. 1896. (Type from Arizona, I'ringle ni 1884.) Diplachne mendocina Kurtz, Bol. Acad. Ci. C6rdoba 15: 521. 1897. (Based on Ipnuni niendocinum
Philippi.) Diplachne diibia var. Hiimboldtiana Kuntze, Rev. Gen. PI. 3': 349. 1898. (Type from Mexico.) Diplachne dubia var. Kurtziana Kuntze, Rev. Gen. i': 349. 1898. (Type from Argentina, Kurtz
6647.) Diplachne dubia var. Pringleana Kuntze, Rev. Gen. 3': 349. 1898. (Type from Chihuahua, Mexico,
Pringle 423.) Leptochloa dubia var. f ri«g!faHaScribn.& Merr. Bull. U. S. Dep. Agr. Agrost . 24: 27. 1901. (Based
on Diplachne dubia var. Pringleana Kuntze.) Rabdochloa dubia Kuntze; Stuck. Anal. Mus. Nac. Buenos Aires III. 4: 121. 1904. (Based on
Leptochloa dubia Nees.) Sieglingia dubia Kuntze; Stuck. Anal. Mus. Nac. Buenos Aires III. 4: 128. 1904. (Based on
Chloris dubia H.B.K.) Eragroslis mendocina Jedw. Bot. Archiv. S: 192. 1924. (Based on Ipnum mendocinum Philippi.)
Perennial; culms in dense, rather tough clumps, erect, simple or branching, 40 cm. to more than a meter tall, glabrous; sheaths mostly shorter than the internodes, glabrous, or sparsely pilose on the margins, at least the lower ones keeled, the upper ones rounded on the back; ligule I mm. long, minutely lacerate; blades flat, 10-25 cm. long (or the uppermost shorter), 2-6 mm. wide, scabrous, often pilose on the upper surface near the base; inflorescence 8-20 cm. long, with several ascending to spreading, scattered spikes, the lower ones 8-10 cm. long; spikelets 4-10-flowered, the florets spreading; glumes acuminate, the first 3 mm. long, the second a little broader, 3.5-4 mm. long; lemma 3 mm. long, awnless, minutely pubescent on the margins, sparsely pilose on the internerves, the tip with two broad rounded lobes.
Type uoc.m.itv: Mexico (Humboldt b" Bonpland).
DrsTRTBUTioN: Dry rocky hills and open ground, southern Florida; Oklahoma and Texas to Arizona, and southward through Mexico; also in Argentina.