?52 Mr. D. Don's Descriptions of new Genera and Species 



5-partito; marginales non radiantes, limbo irregulari, ob 

 laciniam quintain (interiorem) profundiiis sejunctam, indh 

 quasi bilabiati : segmentis linearibus, obtusis, subsecundis, 

 canaliculatis, nervis prorainulis, summo apice confluenti- 

 bus. Filamenta lineari-angustissima, compressa, glabra. 

 AnthercB semi-exsertae, in tubum connatae, appendicul^ 

 lineari-lanceolatA,, obtus4, coriaced, rigid^, ips^ antherd 

 breviore coronatae, basi longfe biaristatae: aristis lineari- 

 bus, setaceo-acuminatis, canaliculatis, antherd longioribus, 

 aequalibus. Stylus filiformis, basi bulbosus. Stigma mas- 

 culis pentagonum ! obtusum, indivisum ; ligulis tereti-cla- 

 vatum, laeve, exsertum ; foemineis bipartitum, exsertum : 

 lobis lineari-lingulatis, obtusis, pruinosis, persaep^ spira- 

 liter convolutis. Achenia lineari-oblonga, compressa, gla- 

 berrima. Pappus masculis cinereus, caducus : radiis inae- 

 qualibus, paleaceo-setaceis, complanatis, longissimis, den- 

 ticulis spinulosis exasperatis, apice acuto, nunc subpeni- 

 cillato, infr^ medium flexuosis, simplici tantCim ordine 

 digestis ; foemineis capillaris, persistens, albus : radiis tri- 

 plici serie confertissimis, denticulato-scabris, longioribus 

 basi latiore subpaleaced. 



Frutices niveo-lanati. Folia alterna, petiolata, integra. Flores 

 terminales, plerumque solitarii, sessiles, magni, purpurei, 

 cernui. 



Nomen a dia^ev^i^ separatio, et generi huic imposuit, ob flores 

 raros esse dioicos in hac familid. 



This is without doubt the most remarkable genus of the whole 

 family. It is dioecious, and, in the structure of the capitula and 

 pappus of the male and female flowers, it differs as much as 

 Antennaria. The male capitula are very much smaller, and 

 besides the male florets of which they are composed, there is a 

 single series of ligulate florets, either with or without pistilla, 



and 



