CRUCIFERAE 155 



26. ARABIS L. 



Basal leaves with pinnatifid blades. i. A. lyraia. 



Basal leaves with toothed blades. 

 Seeds wingless. i. A. dentata. 



Seeds winged or margined. 

 Capsules erect or nearly so, sometimes appressed. 

 Corollas over 7 mm. broad : capsules not appressed : style i mm. long. 



3. A. patens. 

 Corollas less than 7 mm. broad : capsules appressed : stigma sessile. 



Seeds in i row in each cavity of the pod : stem pubescent. 



4. A. hirsula. 

 Seeds in 2 rows in each cavity of the pod : stem glabrous. 



5. A. glabra. 

 Capsules recurved. 



Plants glabrous, glaucous : pods 1-2 mm. wide. 6. A. laevigata. 



Plants pubescent, at least below : pods 2.5-3.5 mm. wide. 



7. A. Canadeytsis. 



1. Arabis lyrata L. IvYre-lEaved Rock-cress. (Man. p. 463; I. 

 F. y^ 1772.') Rocky or sandy places, Ont. to Man., Va., Ky. and Mo. 

 Also in Japan. — Pennsylvania : Monroe ; Northampton ; Bucks ; 

 Montgomery ; Chester ; Lancaster ; Dauphin ; Huntingdon ; 

 Delaware ; Ai^legheny. 



2. Arabis dentata T. & G. Toothed Rock-cress. (Man. p. 464; 

 I. F. /. 1774.) In woods or on banks, western N. Y. to Minn., Tenn. 

 and Mo. — Pennsylvania : Luzerne ; Allegheny. 



3. Arabis patens Sulliv. Spreading Rock-cress. (Man. p. 464; 

 I. F. f. 1776.) On shaded banks, Pa. to Minn., Ala. and Mo. — Pennsyl- 

 vania : Montgomery ; Berks ; Chester ; Lancaster ; Luzerne ; 

 Franklin ; Huntingdon. 



4. Arabis hirsuta (L-) Scop. Hairy Rock-cress. (Man. p. 464 ; 

 I. F. f. 1777.) In rocky places, N. B. to B. C, the mountains of Ga., 

 Ariz, and Calif. Also in Eu. and Asia. — Pennsylvania : Northampton ; 

 Lancaster ; Chester. 



5. Arabis glabra (L.) Bernh. TowER Mustard. (Man. p. 465; I. 

 F. f. 1781.) In fields and rocky places, Quebec to Pa. and the Pacific 

 Coast. Also in Eu. and Asia. — Petmsylvania : Pike ; Monroe ; North- 

 ampton ; Wayne ; Tioga ; Franklin ; Allegheny. 



6. Arabis laevigata (Muhl.) Poir. Smooth Rock-cress. (Man. p. 

 464 ; I. F. f. 177S.) In rocky woods, Quebec to Minn., Ga. and Ark. — 

 Pennsylvania : Northampton ; Bucks ; Philadelphia ; Chester ; 

 Lancaster ; Franklin ; Huntingdon ; Allegheny ; Delaware. 



6a. A. laevigata Burkii Porter. (Man. p. 464.) Dauphin ; Frank- 

 lin ; Westmoreland. 



7. Arabis Canadensis L. SicklE-pod. (Man. p. 464 ; I. F./. 1779.) 

 In woods, Ont. to Minn., Ga., Ark. and Tex. — Pennsylvania : Monroe ; 

 Northampton ; Bucks ; Chester ; Lancaster ; Luzerne ; Somer- 

 set ; DELAWARE ; Allegheny. 



