GENERA. xxi 



equal, deeply boat-shaped, enlarging towards tte apex, very obtuse. Pales 3, included ; the 

 outer beaked. Seed loose, p. 402. 



879. SPARTINA. Spikes compound. Spikelets 1 -flowered. Glumes very unequal ; the 

 inner acuminate. Styles united for half their length. Nect. 0. p. 403. 



895. OREOCHIiOA. Spikelets many-flowered, in a simple spike or head. Glumes and 

 outer Pale concave, membranous, with a scariose margin, p. 408. 



Knappia minima. Triticum, Nardus and unilaterale. Testuca maritima and divaricata. 

 Sclerochloa loliacea. 



iv. Spikelets sessile, two- or more flowered, in a head or spike, tiled all round. 

 894. SESLEE.IA. Outer Pale membrano-scariose, ending in 3-5 soft, flexible teeth. Stig- 

 mas long. Styles united below, p. 408. 



V. Spikelets scattered, one- or more flowered. The Fits, enveloped in long silky hairs. 



871. ARITIfDO. Glumes membranous, equal, or the outer largest. Pales membranous. 

 Awn, if any, fine and slender. Pan. spreading, p. 401. 



872. AMMOPHILA. Spikelets 1-flowered, with an interior rudiment. Glumes nearly 

 equal, membrano-scai'iose. Outer Pale membranous, with a short, strong point below the apex. 

 p. 402. 



873. PHRAGMITES. Spikelets many -flowered ; the lowermost imperfect and not enve- 

 loped in hairs. Glumes membranous ; the outer much the smallest. Pales scariose, unarmed. 

 p. 402. 



874. AMPELODESMOS. Spikelets many-flowered ; the lowermost perfect, unless where 

 the Glume is changed into an imperfect Pit. Outer Glume rather the smallest. Pale with a 

 subapicular awn. Seed crested ! Pan. difi"use. p. 402. 



vi. Spikelets scattered, one-flowered, without glumes. 



848. LEEE.SIA. Pales ribbed, herbaceo-membranous, of equal length, nearly valvular ; 

 outer boat-shaped, unarmed. Fan. lax. p. 397. 



vii. Spikelets scattered, one-flowered, in a spike-like panicle or head. 



856. ACHWODOIfTOH. Spikelets spindle-shaped. Glumes equal, boat-like, unarmed, 

 including. Outer Pale unarmed, embracing the inner of equal length, p. 898. 



857. PHLETJM. Spikelets oblong. Glumes nearly equal, setigerous, parallel on the keel, 

 including 3 unarmed pales, p. 398. 



858. ALOPECimirS. Glumes equal, unarmed, «<ra«^^y 2«?eY«(^ «^ ^fl-^g .' Pale 1, shorter 

 than glume ; the margins in some species utiited below ! Awn dorsal, p. 398. 



859. CE.YPSIS. Head or Spike included in most species in a common involucrum. Glumes 

 membranous, unarmed. Pales 2, entu'e, membranous, unarmed, as long as glumes. C. acu- 

 leata has only 2 stamens ; C. alopecuroides a naked spike, p. 399. 



860. GASTBIDIUM. Glumes ventricose at base, including pales, scariose. p. 899. 



882. LAGURUS. Glumes scariose, ending in a long, fringed seta. Outer Pale quite 

 smooth, ending in 2 setas and an intermediate, geniculate and twisted, dorsal awn. p. 404. 



847. LAPPAGO. Outer Glume scariose ; inner coriaceous and prickly, p. 397. 

 Polypogon monspeliensis and maritimus. 



viii. Spikelets one-flowered, scattered in a loose panicle. 



864. VILE A. Glumes membranous, unequal, not exceeding pale. Pale membranous, un- 

 ai-med. p. 400. 



863. AGE.OSTIS. Glumes membranous, including. Pales unequal, smooth, not hardening 

 on the seed. Awn, if any, slender, dorsal, p. 399. 



