SYNOPSIS OF THE GENERA. 
45. Acuit'tea, [Page 1097.] - Zncolucrum ovate, imbricated. 
Florets of the circumference from five to ten, its limb 
short, roundish. Receptacle flat, paleaceous. Srutt 
compressed, the apex simple, or crowned by a prominent 
margin. 
Croer III. PotyGamia FRUSTRANEA. 
(Florets of the disk perfect and fertile, those of the circum- 
Serence neuter). 
46. CenTAu'REA, [Page 1099.] Jnvolucrum imbricated, its 
scales leafy, membranous, or spiny. Jorets of the cir- 
cumference longer than those of the disk. Receptacle 
paleaceous, its scales much cut or jagged. Pappus hairy, 
or wanting. /ruzt compressed. 
CiLass 20. GyYNANDRIA. 
(Stamens situated upon the style or column, above the 
germen). 
Orver I. Monanpria.—l Stamen. 
(All the Natural Order Orchidee, Juss. 
TrivE 1. Pollen masses stalked, of an indefinite number of 
cohering grains, enclosed in a pouch. (OPHRYDES, 
Lindley.) 
1. Or'cuts, [Page 1103.] Sepals and. petals personate, rin- 
gent, dip lobed and spurred at the base. Pollen masses 
with two glands, enclosed in a common pouch. 
2. GyYMNADE NIA, [Page L111.] Pollen masses naked, ap- 
proximated, the rest as Orchis. 
3. Hapena’ria, [Page 1112.] Sepals and petals personate, 
ringent, arched or helmet-shaped above, lip spurred at 
the base. Glands of the stalks of the pollen masses 
naked, distant. 
4, Acr’ras, [Page 1114.] Sepais and petals herbaceous, per- 
sonate, ringent, helmet-shaped above, /ip three partite, 
without a spur at the base. Glands of the stalks of the 
pollen masses enclosed in a common pouch. 
5. Hermi'nrum, [Page 1115.] Sepals and petals herbaceous, 
spreading, /ép short, lobed, not spurred, but saccate at 
