16 



Folia radicalia conferta, petiolata, lanceolata, integerrima, 

 aut dentata, aut lyrato - pinnatiiida, aut pinnata, ad den- 

 tium apices saltem ciliata, disco glabra, vel parce pilosa, 

 pili simplices, rarius bifurci, rari, Petioli basi ciliati, 

 Caules 2-3 ex quoque radicis capite lateraliter Orientes, 

 spithamaei, erecti nee admodum stricti, simplices, glabri. 

 Folia caulina sparsa, 3-5, lanceolato-linearia, acutiuscula 

 aut obtusa, inferiora saepius in petiolum attenuata, dente 

 uno alterove instrueta, superiora integerrima. Racemus 

 terminalis, ()-lQflorus. Pedunculi caljee triplo longiores, 

 fruetiferi paullulum elongati apiceque parum incrassati, 

 inlimus bractea iiliformi ipso breviori saepius suffultus. 

 Flos paullo major quam Arabidis alpinae. Petala calyce 

 duplo longiora, alba aut purpurascentia, late obovata, in* 

 tegerrima. Glandula inter sepala superiora et stamina 

 znajora. 



3. Arabis ambigua DC. I. c. p.231, 

 ß. intermedia. 



Arabis Ijrata Herb. Willd. n. 12187, speeimen pen- 

 sylvanicum dextrum, sinisti'um est Arabis arenosa. 



Arabis lyrata Lin? 



In arenosis graminosis littoralibus insulae Unalaschka 

 copiose. Annis 1816 et 1817. 



Descriptio. Radix ramosa biennis, primo et altere 

 anno caules fruetiferos proferens, nee plures annos per- 

 durans. Caules plures, 4-8, basi adscendentes, erecti 

 florentes digitales spithamaei, fruetiferi digitales aut ses- 

 quipedales, simplices aut ramosi, omnino glabri aut ul 

 in Arabide arenosa pilis retrorsis hirti. Folia radicalic 

 conferta, petiolata, lyrato -pinnatifida, glabra, pilis per- 

 paucis simplieibus rarissime ciliata. Petioli basi ciliati 

 Folia caulina infera ovalia, in petiolum attenuata, sae- 

 pius dentata, superiora angusta integerrima. Racemm 

 terminalis 6-16florus. Pedunculi ebraetati, calyce qua- 



druplc 



