80 | COMPOSITA. 
convexum; corolle parcissime glandulose, omnes tubulose, cylindrice, lobis brevissimis ; 
anther incluse, appendiculatz (in speciminibus nostris vacuz) ; styli rami longe exserti. 
Achenia subobliqua, 4—5-costata, nigra, parcissime glandulosa, basi callosa, apice disco carnoso 
coronata. 
Souta Mexico, Cuernavaca (Bourgeau, 1216 ; Bilimek, 579). Hb. Kew. 
This species differs from A. ageratoides, H. B. K., in its foliage, shorter involucral 
bracts, longer corollas, and flat receptacle. All the anthers we examined were quite 
empty. 
17. TRICHOCORONIS. 
Trichocoronis, A. Gray, Pl. Fendl. p. 65; Benth. et Hook. Gen. Plant. ii. p. 240. 
Two herbaceous species. 
1, Trichocoronis greggii, A. Gray, Pl. Wright. i. p. 89. 
Mexico, between Mexico and Mazatlan (Gregq). 
2. Trichocoronis rivularis, A. Gray, Pl. Fendl. p. 65. 
New Mexico, Texas.—NortH Mexico, Monterey (Berlandier, Eaton & Edwards, 
Gregg), Cerralvo (Gregg), San Luis to Tampico (Palmer, 1091). Hb. Kew. 
18. ASCHENBORNTA. 
Aschenbornia, Schauer in Linnzea, xix. p. 716; Benth. et Hook. Gen. Plant. ii. p. 241. 
A monotypic shrub. 
1. Aschenbornia heteropoda, Schauer in Linnea, xix. p. 716. 
Nort Mexico, Tacubaya (Aschenborn). 
19. AGERATUM. 
Ageratum, Linn. Gen. Plant. n. 936; Benth. et Hook. Gen. Plant. ii. p. 241. 
About twenty-four herbaceous and shrubby species inhabiting Tropical and Sub- 
tropical America, and one of them widely dispersed in warm countries of the Old 
World. 
1. Ageratum adscendens, Schz. Bip. MSS. in Hb. Kew. 
Perenne, decumbens, glanduloso-pilosum, ramis floriferis paucifoliatis adscendentibus, foliis oblongo- 
obovatis usque orbicularibus crenatis, capitulis mediocribus paucis cymosis, involucri bracteis 
ad 12 biseriatis lineari-oblongis acutis herbaceis glanduloso-pilosis, receptaculo nudo, corolla 
glabra infundibuliformi, acheniis elongatis hispidulis, pappi paleis 5 brevibus fimbriatis. 
Herba perennis, decumbens, omnino piloso-glandulosa, ramis floriferis paucifoliatis, adscendentibus, 
semi- usque sesquipedalibus. Folia oblongo-obovata usque orbicularia, inferiora conferta, 
distincte petiolata, superiora distantia, sessilia, 1-8-pollicaria, crenata, demum glabrescentia. 
Capitula ad 25-flora, 3 lineas et ultra diametro, pauca, cymosa ; involucri bractee ad 12, sub- 
biseriatze, lineari-oblonge, acute, herbacex, glanduloso-pilosz ; receptaculum parvum, nudum, 
planum ; corolla glabra, infundibuliformis, infra medium angusta. Achenia elongata, hispi- 
dula, recta, 5-angulata; pappi palez 5, breves, fimbriate. 
