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 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.

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