10 PROCEEDINGS OF THE AMERICAN ACADEMY 



Inflorescence effusely elongated-paniculate: small flowers slender-peJicelled ; 

 scapes 2 or 3 feet high, the branches commonly subtended by leafy 

 bracts: calyx reflexed : leaves ample, thin, 

 Denticulate, oval to elongated oblong, 4 to 8 inches long: filaments 

 filiibrm. S. Forbesii. 



Acutely and unequally dentate, oblong-lingulate, often a foot long : fila- 

 ments clavato-dilated. 5. erosa. 

 Inflorescence corymbiform- or paniculatecymose, open when evolute : plants 

 mostly low and scape naked : leaves thickish, short and broad, not dis- 

 tinctly cuneate-attenuate at base, either dentate or only repand. 

 Calyx erect or barely spreading after anthesis : pedicels of the dichoto- 

 mal and pseudo-lateral flowers short, mostly shorter than the calyx : 

 filaments filiform-subulate. 

 Petals pale rose-color. S. eriophora. 

 Petals white. 5. Virginiensis. 

 Calyx reflexed in or after anthesis, almost free : pedicels all slender anil 

 longer than calyx : filaments disposed to be upwardly dilated, some- 

 times conspicuously so. .S". rcjlexa. 



2. Rhizomatose, the rootstock herbaceous and commonly slender : plants not 



bulbilliferous. 

 Leaves roundish or oval, dentate, mostly abruptly (truncately or even sub- 

 cordatcly) contracted into margined petioles : flowers small and numerous 

 in an eflTuse compound panicle; its branches and pedicels divergent: 

 petals more or less bimaculate. 



Calyx barely spreading : filaments filiform. 5. Careyana. 



Calyx reflexed: filaments clavately dilated. S. CaroUniana. 



Leaves cuneate and attenuate into margined petioles or contracted base, 



above incisely dentate. 



Calyx erect or barely spreading : filaments slender : flowers small and 



numerous : leaves flabelliforin-cuneate. 6\ Dahurica. 



Calyx reflexed : capsule often 3-5-carpellary. 



Filaments slender : capsule short and turgid : stj'lcs hardly any : 

 flowers comparatively large and few, siiort-pedicelled : leaves cu- 

 neate and short petioled. S. Unalaschensis. 

 Filaments, or some of them, dilated upward: capsule narrower and 

 longer, more styliferous • leaves more narrowly cuneate and more 

 petiolate. S. Lynlli. 

 Leaves mostly round-reniform, coarsely dentate, on long and naked or barely 

 margined petioles, 



Small, usually rather flabelliform than reniform, 3-91obulate : petioles, 

 scape (a span high, with few flowers in a loose corymbiform cyme), 

 and rootstocks filiform : calyx erect : filaments filiform. S. nndicnnlis. 

 Larger, 7-27-lohulate-dentate : scape a span to a foot high : inflores- 

 cence tiiyrsoidly paniculate or in dwarf forms condensed: creeping 

 rootstock thicker: calyx reflexed in fruit: filaments mostly dilated 

 upward. S. punctata. 



3. Not rhizomatose, but a scaly-bulbous crown, formed of the dilated-scarious 



bases of the long petioles, and producing fleshy bulblets in their axils : 

 inflorescence also bulbilUferous : leaves and flowers nearly of the last 

 preceding species. S. Mettensiana. 



