97. GRAMINJEJS. 



which usually become turgid at flowering, or may be absent. 

 8t, 2 or 3, rarely (Bice, some Bamboos, etc.) 6. Anthers 

 versatile. Ovary with 2 (rarely 1 or 3) usually feathery 

 rstigmas. Ovule 1. Ovary wall adherent to the seed in 

 fruit, frequently also to the pale and glume. 



(JNcte.—The glumes in a spikelet are numbered in Eoman- figures from 

 the base upwards.) 



A, Each spikelet with only 1 or 2 flowering glumes, if 2 then only 

 the upper one fruiting. Eachilla articulate on the pedicels (exc. in 

 Arundinella, Pennisetum, and Isachne) below the empty glumes, decidu- 

 ous (so that the whole spikelet falls off together when old), or deciduous 

 with the pedicel in Pennisetum. Eachilla of the spikelets not articulate 

 above the lowest glumes. 



I. Spikelets, not geminate. Eachife of the spike 

 not articulate. 



o. Spikelets spicate. 



1. Spikelets fascicled on the spike. 



Spkts. sessile in deciduous fascicles with an involucel 

 of bristles . . . ^ . . . .1. Pennisetum. 



Spkts. shortly pedicelled, involucel of bristles 

 persistent 2. Betaria. 



2. Spikelets not in fascicles. Fruiting 



glume and pale much hardened. 



Glumes on one side of a flattened raohis, 

 never awned 3. Parpalum. 



Raohis of spike not flat 4. Panicum. 



b. Spkts. panicled, not spicate 



1. Glumes 4, two lowest, sometimes 3 



empty. 

 Gl. I very small. Ill usually male, IV 2-sexual 



hardening . 4. Panicum. 



Gl- I and II minute. Ill empty, IV clothed with 



white hairs ... * ..... 5. Thysanolcena. 



2. Glumes 4, III and TV usually awned 



and flowering. Spkts. not articulate 



on pedicel . . . 6. Arundinella. 



3. Glumes 2-3, III much the largest and 

 strongly nerved 7. Cryza. 



II. Tribe Andropogonese. Spikelets geminate, 

 usually one sessile and one pedicelled, 



556 



