12 KORTH AMERICAN SPECIES OF LEPTOCHLOA. 



spikes usually 8 to 15 cm. long. Spikelets 3 to 4 flowered. 1 to 2 mm. long, 

 rather distant on the axis, that is, scarcely overlapping. Empty glumes about 

 equal, lanceolate, acute or acuminate, nearly as long as the spikelet. or some- 

 times longer, lower slightly narrower. Flowering glumes thin, awnless, 

 smooth or somewhat pilose on the nerves. 



The form separated as L. attenuata has large panicles, with acuminate empty 

 glumes and flowering glumes pilose on nerves. 



Distribution.— F/rguuo toFlorida and west to California: Hall. TT7. 778; Wright; 

 765: Bush, 468. 590; Curtiss, 5998; Coulter, 785; Lindheimer. 212. Mexico: 

 Palmer, 248. 22, 694. 749, 1364, 117. 50 (in part); Rose, 1542; Schott, 739, 590. 

 Yucatan: Gaumer. 853. Cuba: Wright. 740 (in part), 741 (in part). Porto 

 Rico: Sintenis, 3550. 



Var. PUIiCHELLA Scribn. Bull. Torr. Bot. Chib. 9: 147. 1882. " Santa Cruz 

 Valley, near Tiicson."" 



Distribution.— rea^a.s to Arizona: Heller. 1884: Hall, 777, 778; Coues & Palmer, 

 511; Jones, 4176. 3Iexico: Palmer. 50 (in part). oOi, 694.8: Wright. 1316. 

 Differs from the type in the short branches of the panicle, 2-3 cm. long, and 

 the short narrow leaves. 



LEPTOCHLOA VIRGATA Beauv. Agrost.. 166; Atlas, p. 10. 1812. Refers 

 Eleusine virgata to his new genus Leptochloa (I.e. p. 71 ). (Fig. 3.) 



Fig. 3.— 7.. virr/ata, from St. Croix. 



CynosvruH virgatns L. Syst. Nat., Ed. X: 1759. No locality is given, but he 

 refers to Sloan jam., t. 70., f. 2, which is probably this species. In Spec. PI., 

 Ed. 2. the locality is "Habitat in Jamaica." See Munro. "The Grasses of 

 Linnteuss Herbarium."' Proc. Linn. Soc. Bot. 6: 33-35. 1862. Linnaeus 

 mentions that the lower flowers are subaristate. 



Festuca virgata 'Lam. 111.1:189. 1791. " Ex ins. Domingi." States that the 

 spikslets are aristate and " floscul. ultimis submuticis. " ' 



Eleusine virgata Pers. Syn. 1: 87. 1805. Description taken from Lamarck, I.e. 



Oxydenia virgata Nutt. Gen. 1 : 76. 1818. This is the citation often given, but 

 is an error, asNuttall merely says. " To this genus belongs Eleusine filiformis 

 of Persoon . . . and we may probably add the Eleusine virgata of Jamaica." 



Chloris pohjstachya Lag. Nov. Gen. 4. 1816. The short description scarcely 

 suffices to determine this plant. " Spicis pluribus. patentibus: calycibus flos- 

 culisque glabris. muticis: ciilmo compresso. H. in N. H. unde semina missit 

 D. Sesse." 



Chloris pofeformis H. B. K. 1 : 169. 1815. " Crescit in calidissimis humidis fl.u- 

 minis Magdalene prope Mompox: item prope Guayaquil et San Eowndon 

 Quitensium." As synonyms are given Cynosurus virgatusL.. Eleusine vir- 

 gata Willd.. and Leptochloa rt/-gato Beauv.. but a new specific name is applied 

 because there is already a Chlorin virgata Sw. In the description it is stated 

 that the awn is very short. 



Leptochloa procera Nees in Syll. Ratisb. 1: 2. 1828. Type examined at Berlin. 



Leptochloa digitaria Willd., ex Steiul. Nom. Ed. 2. 1: 549. 1840. Types of this 

 and the next examined in herbarium Willdenow. Both specimens labelled 

 " Habitat in America Meridionalis, Humboldt." 

 Leptochloa unioloides Willd., 1. c. 



