GRAMINE.E. Isehaemum. 205 



culo exteriore glum* sessilis bivahi, saepiusque masculo : 

 a Rottboellia gluma altera pedicello soluto insidente. Is- 

 chaemo igitur affinis est Rottboellia digitata Flor. Grcec, 

 et diversa tptum pedicello juxta apicem articulato, squa- 

 misque hvpogynis lobatis lacinula exteriore longiore. ' 

 Colladoa Cauan. I. c. genuina species Ischeemi est, ut patet 

 ex figura, et descriptione mutatis partium nomiiiibus. 



I. Spicce conjugatce, dimidiatce, gluma pedicellata, liflora, 



sessili utfilurimum similts. 



1. I. tritkeum, racheos angulis barbatis, glumis imberbibus 



laevibus : interioris carina supra alata, perianthii herma- 

 phroditi arista exserta, foliis lanceolatis, vaginis imis hir- 

 sutis, geniculis barbatis. (T.) v. v. 



Obs. Proximum I. mutico £. in quoarista brevior subinclusa 

 et geniculi culmi imberbes. Ab I. murino differt statura 

 majore et geniculis barbatis. 



2. I. australe, racheos pedicellique angulis barbatis, gluipis im- 



berbibus laevibus : interioris carina subsimplici, perianthii 

 hermaphroditi arista inclusa brevissima, foliis vaginisque 

 glabris laevibus, culmo erecto, geniculis barbatis. (J.) v. v. 

 Obs. Nimis affine 1. mutico, L. 



3. l.villosum, racheos pedicellique angulis barbati«, glumis 



laevibus: exteriore basi villosa, perianthii hermaphroditi 

 arista exserta, foliisscabris, vaginis laevibus, culmoerecto, 

 geniculis barbatis. (T ) v.v. 



II. Spicce solitarice, timplices, aristatce: gluma pedkellata, 



1 — 2-Jiora, mascula v. neutra. 



4. l.fragile, spica tereti, racheos articulis pedicellisque obc- 



vatis ventricosis intusconcavis membranaque scariosii tectis, 

 arista glumae ijiterioris setacea brevi ; perianthii genicu- 

 lata elongata, foliis pubescentibus, geniculis barbatis. (T.) 

 B. v. s. 



5. I. laxum, spica subnutante, racheos pedicellique angulis bar- 



batis, glumis submembianaceis nervosis glabris ; pedicellata 

 biflora ; flosculis masculi* muticis. (T.) v. v 



III. Spica? siwplkes, fasciculatce, muticce : gluma pedkellata, 



mascula v. neutra. 

 0\ I. Rottloellioides, spicis filiforniibus glaberrimis lae\ ibus al- 



ternatim 



