DICOTYLEDONES. 207 



32. SiEVERSiA Rossii, aristis niidis, foliis radicalibns 

 inteiTiipte ])inn!itis f>;la]jris : piiinis trilobis ; accessoriis 

 iniisquc iiaiiis indivisis, caulc iiiiitioro subdiplnllo, pctaloruin 

 venis omnibus distinctis. 



Desc. Jlcrha pcrennis, 2 — G-uncialis, glabra. Cat/dcx 

 demersus, radiciformis, squamis scariosis fiiscis (petiolonini 

 reliquiis) tectiis, infra niedietatem fibras descendcntes sim- 

 plices fibrillosas crassiuscidas ])roferens. Folia radicalia 

 nunierosa (4 — 7,) glabriuscula, pctiolata, interruj)tc piiuiata, 

 exstipulata, pinniscircumscriptione ovatis cuneatisve, trifidis 

 vel bifidis (lobo supcriorc latcraliiun deficientc) basi ina^quali, 

 inferne in racliin decurrcnti, supcrioribus aj)proxiiiiatis, 

 nanis indivisis interpositis inter niedias; iniis ipsis minimis 

 integerrimis. Pefioli infra medinm dilatati il)iqne scariosi, 

 pallide fusci. Scapi ex alis folioruni radicalium vel squa- 

 niarum superiornm caudicis demersi, infra nudi, extra 

 medium foliis sa?pius duobus, alternis, sessilibus, pinnati- 

 fidis, exstipulatis, in statu florescentiae (cum scapi folia 

 radicalia vix sequant) invicem apicique scapi approximatis, 

 in fructiferis folia radicalia aliquotics superantibus, ab 

 invicem at ab apice saepe distantibus ; teretes, pubescentes, 

 pube descendendo sensim parciore. Flos solitarius, erectus, 

 ebracteatus. Cali/x extus pubescens, decemfidus, tubo brevi 

 turbinato, laciniis 5 majoribus interioribus, late semiovatis, 

 acutiusculis, quinque alternis dimidio minoribus, ovalibus, 

 petalis oppositis. Petala 5, obovata, integerrima, venosa, 

 aurea, sinubns laciniarum majorum calycis inserta [cchxvii 

 iisque sesquilongiora. Stamina fauci calycis inserta, indefi- 

 nita, 30 plura. Filamcnfa subulata, glabra. Antlterce 

 ovatae, flavae, basi semibifidoe, loculis parallclo-approximatis, 

 longitudinaliter dehiscentibus. Pollen globosum, simplex. 

 Ovaria indefinite numcrosa, reccptaculo subcylindraceo 

 imbricato inserta, breve pedicellata, ab apice pedicellorum 

 solubilia, hirsuta, pilis acutis strictis, monosperma, oviilo 

 adscendente. Sfi/Il terminales, filiformes, subulati, glabri, 

 stricti. Sligmaia dilatata, obliqua, retusa, paj)ulosa. 



Ohs. This species is named in honour of Lieutenant 

 James Ross, in whose well-preserved herbarium several 

 plants were found not contained in the other collections. 



