GRAMINA. 



395 



10. AVENACEJ3. — Spicules of more than one floret. Glumes scariose on the 



margin, neai'ly equal, and almost or quite as long as the spicule. Awn, 

 if any, dorsal, and geniculate and twisted. In Gaudinia the glumes fall 

 very short of the spicule . . . . . . . . . Gen. 880-888. 



11. FESTUCACEjE. — Spicules of more than oue floret, scattered. Glumes 



scariose, unequal, falling short of the spicules. Outer Pale herbaceous 



or membranous ; inner scariose ........ Gen. 889-904. 



12. HORDEACE^.— Spicules with an interior rudiment, or with more than 



one floret; in opposite rows, on an alternately channeled rachis . . Gen. 905-911. 



13. PAPP0PH0RJ5L. — Glumes entire, less fii-m than the outer pale, which is 



coriaceous, tei-minating in many rigid points. Spicules 1- or more flow- 

 ered, sessile in a tiled head ........ Gen. 912. 



14. ROTBOELLACEJC. — Spicules (in the European genera) all perfect, with 



only oue perfect floret (except in Lepturus pannonicus) ; sessile, or 



imbedded in a channeled rachis. Glumes, if any, unilateral . . . Gen. 913-915. 



Tribe I. AKDROPOGONEM 



Sect. I. Spicules all fertile, clothed 

 witli long silky hairs. 



837. SACCHARUM. 



1. segyptiacum. Pan. lanceolate, crowded: 

 lower branches compound. Stalks villous. L. 

 keeled. Margin very rough. Culm downy. 

 p. 7, 8. Banks of the Oreto at Palermo. 



838. IMPERATA. 



1. cylindrica. L. convolute. Knots smooth. 

 p. 6-8. Sandy shores of Mdt. 



839. ERIANTHUS. 



1. Ravennse. 



channeled, p. 8- 

 Mdt. 



Pan. much branched. L. 

 10. Beds of torrents near 



Sect. II. Lateral or stalked Spicule 

 barren. 



[There is usually the rudiment of an external 

 floret in the fertile spicule.] 



840. ANDROPOGON. 



1. AUionii. Spike solitary. Cubn branch- 

 ed. L. rough. Sheaths haiiiess. Glumes and 

 Stalks of barrea Spicules smooth ; of fertile 

 hispid. Awn veiy long, downy, p, 7, 8. 

 Limestone rocks. Nice. it. Lakes. 



2. distachyTis. Spikes in pairs, terminal. 

 Barren Spicules awTied. Cuhn undivided, p. 

 5. Stony. Nice. Prov. 



8. hirtus. Spikes in paii's, panicled. Bar- 



3 



ren Spicules awnless. Upper part of the 

 Stalk, common to a pair of spikes, with long 

 hau's. p. 7- Dry. It. mdt. Er. 



4. pubescens. Spikes in pairs, panicled. 

 Awns of complete Fit. sis times as long as 

 floret. Barren Spicule awnless. Upper part 

 of Stalk downy, p. 8, 9. Campania. — Bert. 



5. Ischseixium. Sinkes many, fan-like. 

 Glumes striate. Lower Glume and Stalk of 

 the awned complete Spicule hairy, p. 7, 8. 

 Dry hills, s. Eur. Spicules purplish. 



6. Gryllus. El. in panicles. Branches 

 whorled, spreading, 3-flowered. p. 6, 7. Dry 



hills, s. Em'ope. 



841. SORGHUM. 



1. vulgare. Pan. compact, branched. 

 (Branches dowTiy. Rachis haii-less, Kunth.) 

 (Awn from extremity of pale, Duby.) (Bar- 

 ren Fl. on very short stalks, Koch.) Bai-ren 

 Pits, extending considerably beyond fertile. 

 L. and Sheaths smooth. Root fibrous, a. 6, 

 7- Escapes, s. Fr. It. 



2. halepense. Pan. spreading. (Branches 

 and Rachis rough, Kunth.) (Awn continued 

 down to receptacle, Dtjby.) (Stalk of bar- 

 ren Fit. about haK as long as floret, Kunth.) - 

 Barren Fits, extending considerably beyond 

 fertOe. L. and Sheath smooth. Root creep- 

 ing, p. 7, 8. Cult. s. Eur. 



3. strictum. " Pan. rather close. Fl. 

 awned, villous at base. Pales 3 : the middle 

 one bifid. Sheaths villous, p. s. France. 

 Differs from S. halepensis hy its crowded 

 panicle, narrotver L., villous sheaths, and 

 the spicules surrounded by a ring of hairs." 

 — Kunth. 



