DICOTYLEDONES. 207 



32. SiEVERSiA Rossii, ai'istis nudis, foliis radicalibus 

 inteiTupte pinnatis glabris : pinnis trilobis ; accessoriis 

 imisque nanis indivisis, caule unifloro subdiphyllo, petalorum 

 venis omnibus distinctis. 



Desc. Herba perennis, 2 — 6-Tincialis, glabra. Caudece 

 demersuSj radiciformis, squamis scariosis fuscis (petiolorum 

 reliquiis) tectus, infra niedietatera fibras descendentes sim- 

 plices fibrillosas crassiusculas proferens. Folia radicalia 

 numerosa (4 — 7,) glabriuscula, petiolata, interrupte pinnata, 

 exstipulata, pinnis circumscriptione ovatis cuneatisve, trifidis 

 vel bifidis (lobo superiore lateralium deficiente) basi insequali, 

 inferne in rachin decurrenti, superioribus approximatis, 

 nanis indivisis interpositis inter medias ; imis ipsis minimis 

 integerrimis. Petioli infra medium dilatati ibique scariosi, 

 pallida fusci. Scapi ex alis foliorum radicalium vel squa- 

 marum superiorum caudicis demersi, infra nudi, extra 

 medium foliis ssepius duobus, alternis, sessilibus, pinnati- 

 fidis, exstipulatis, in statu florescentiae (cum scapi folia 

 radicalia vix sequant) invicem apicique scapi approximatis, 

 in fractiferis folia radicalia aliquoties superantibus, ab 

 invicem at ab apice ssepe distantibus; teretes, pubescentes, 

 pube descendendo sensim parciore. Flos solitarius, erectus, 

 ebracteatus. Calyx 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, sinubus laciniarum majorum calycis inserta [cokxvii 

 iisque sesquilongiora. Stamina fauci calycis inserta, indefi- 

 nita, 30 plura. Filamenta subulata, glabra. Antherce 

 ovatas, flavse, basi semibifidae, loculis parallelo-approximatis, 

 longitudinaliter dehiscentibus. Pollen globosum, simplex. 

 Ovaria indefinite numerosa, receptaculo subcylindraceo 

 imbricate inserta, breve pedicellata, ab apice pedicellorura 

 solubilia, hirsuta, pilis acutis strictis, monospermaj ovulo 

 adscendente. St^/li terminales, filiformes, subulati, glabri, 

 stricti. Stigmata dilatata, obliqua, retusa, papulosa. 



Ohs. This species is named in honour of Lieutenant 

 James Ross, in vrhose well-preserved herbarium several 

 plants were found not contained in the other collections. 



