223 



diametro arete congesta. BractecB ovatae, acutse, extus 

 tomentosae. Involucri squamm 5, biseriales: exterior 

 rigida, ovato-acuminata, valde concava, gibbosa, uniflora, 

 flore abortive; reliquce 4 membranaceae, floribus duobus, 

 3 exteriores medio glandula longitudinali notatae. Corollce 

 albae, tubo involucre sub duplo longiore sursum latiore, 

 limbo bilabiato; labio superiore oblongo-ovato, reflexo, 

 tridentato ; inferiore bipartite, laciniis linearibus, reflexis. 

 Stamina 5: AnthercB basi bisetosae. Stigmata revoluta. 

 Achenia obovata, glabra. Pappus pilis subplumosis. 



Hab. Culluay, in the Valley of Canta. 



Amongst all the genera of Labiatiflorce, I am unable to 

 find any which accords with the present plant, here 

 named in compliment to Mr. Bridges, who has already sent 

 many excellent plants from the western side of the Andes of 

 South America, and from whose exertions much more may be 

 expected. In habit it very much resembles some species of 

 Echinops. Each head of flowers contains a great number of 

 involucres, (mixed with bracteae,) which are regularly 3- 

 flowered: the outermost scale of the involucre, which is the 

 largest and most rigid, always contains, within its deeply 

 hollowed base, one imperfect flower ; within that are 4 scales 

 containing 2 perfect flowers. The section of a flower, 

 {Jig. 1,) will give a better idea of the relative situation of 

 the scales of the involucre and bracteas, than can be done 

 by words. 



Tab. XCII. Fig. 1, Transverse section of a flower, with 

 the bractea at its base, showing the relative position of 

 the 5 scales, or leaflets, of the involucre, 4 external and 

 1 internal. Fig. 2, Involucre, with its 3 florets, and the 

 bractea at the base. Fig. 3, One of the innermost 

 flowers, Fig.4<, Portion of a hair of the pappus. Fig. 5, 

 External scale of the involucre, with its abortive flower. 

 Fig. 6, Portion of a hair from the pappus of the latter : — 

 magnified. 



III. VERNONIACEiE. 



5. Baccharis genistelloides ; aphylla, suffi'uticosa, caule ram- 



