Mr. Bentuam on the Eriogonez, a Tribe of the Order Polygonaceze. 405 
I. Involucrum multiflorum. Eritoconum. | 
Folia ramorum floralium stipulata: § 1. SrrPULATA (E. angulosum). 
Folia omnia exstipulata. 
Genitalia pilosa. 
Inflorescentia dichotoma: $ 2. EnrawTHA (E. longifolium, tomento- 
sum). Ss 
Inflorescentia umbellata: $ 3. UMBELLATA. 
*Perianthia villosa: (E. spherocephalum, flavum, crassifolium, 
ceespitosum). 
** Perianthia glabra: (E. pauciflorum, ovalifolium, stellatum, um- 
bellatum, heracleoides, compositum). 
Genitalia glabra. 
Involucra multiflora, sæpiùs glomerata, perianthii laciniz subzequales. 
Folia parva, secus ramos fasciculata: $ 4. FAscicuLaTA (E. par- 
vifolium, fasciculatum). 
Folia longè petiolata, ad basin caulis approximata: § 5. Lati- 
FOLIA (E. oblongifolium, latifolium, auriculatum, nudum, ela- 
tum). 
Involucra parva, secus ramos paniculæ 2—3-chotomæ solitaria, peri- 
anthii laciniæ exteriores acute: § 6. Micranrua (E. multiflo- 
rum, annuum, strictum, niveum, dichotomum, decumbens, tenellum, 
vimineum). 
II. Involucrum uniflorum, sexdentatum. | CHORIZANTHE. 
§ 1. Surrruticosa (Chilenses) : (C. virgata, peduncularis, Macrei, ra- 
mosissima, paniculata, vaginata, glabrescens). 
$2. Hersacez (Californice) : (C. staticoides, Douglasii, membranacea, 
pungens). 
III. Involucrum uniflorum, bidentatum. Mucronga (M. Californica). 
1. EnrocoNuM (Mich.). 
Involucrum tubulosum, campanulatum vel cyathiforme, vix angulatum, sub- 
zequalitér 6-dentatum, multiflorum. Receptaculum bracteolis intra pedi- 
cellos instructum. Perianthia exserta, profundé 6-fida. 
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