334 MR. F. N. WILLIAMS: REVISION 
Subgen. 2. Eremogoneastrum.—Sepala herbacea vel basi indu- 
rata; apicibus recta vel recurva. Petala integra, apice rotun- 
data obtusa vel raro retusa. Stamina 10, glandulis alternantia. 
Discus crenato-lobatus, glandulis prominentibus. ^ Ovarium 
trisuleatum multiovulatum. Styli 3 (in nonnullis floribus 
interdum 4). Capsula oligo- vel polysperma, ultra medium 6 
valvis dehiscens. ^ Semina tuberculata vel levia.—Herba 
perennes, ssepius cespitose, Asiatice et Americans; foliis 
angustis. 
Subgen. 3. Pentadenaria.—Sepala interdum coriacea; apicibus 
recta vel recurva. Petala integra, apice obtusa retusa vel rarius 
dentieulata. Stamina 10. Discus lobatus, in 5 glandulas 
staminiferas prominentes integerrimas vel emarginato-bigibbosas 
expansus. Styli 3. Capsula 6 dentibus vel 3 valvis bidentatis 
dehiseens. Semina granulato-tuberculata vel leevissima.—Species 
perennes, sepe suffruticose. 
Subgen. 4. Dicranilla.—Sepala apicibus marginibusque inflexis 
conniventia. Petala integra, in aliquot speciebus nulla. 
Stamina 5 vel 10, glandulis suffulta. Ovarium trisuleatum ; 
styli 3 (interdum 2). Capsula membranacea ovoidea oligosperma, 
ultra medium 6 valvis dehiscens. ^ Semina levissima nitida 
nigra.—Herbe alpicole, meridionali-Americane, pulvinatim 
cespitose, habitü ab iis aliorum subgenerum valde diverse. 
Folia confertissime 4—5-fariam imbricata minuta ovata vel ovato- 
lanceolata carinata. Flores terminales solitarii sessiles minim 
foliis occultati; gemme axillares, increscentes tandem alares. 
Subgen. 5. Arenariastrum.—Sepala herbacea vel rarius sub- 
scariosa, angusta ; apicibus in anthesi erecta conniventia nunquam 
inflexa. Stamina 10, rarius 5 ananthera. Glandule obsolete 
vel inconspicue, in discum annularem immerse. Styli 2. 
Capsula oligosperma, primum 4 dentibus conniventibus dehiscens, 
tandem in valvas secedens. Semina scabra vel granu late 
tuberculata, subglobosa.—Herbs annus vel biennes multiflore, 
sepius diffuse. 
Subgen. 6. Odontostemma.—Sepala anguste hy lino msg 
ata. Petala erosa vel laciniata. Stamina 10, paullo supe m 
utroque latere gibbosa (veluti glandulà bigibbosa insiden tu) 
Ovarium multiovulatum ; styli 2. Capsula (ovulorum * ven 
oligosperma, 4 valvis dehiscens. Semina magna comP Ter 
