CRUCIFERAE 153 



20. ALYSSUM L. 

 1. Alyssum alyssoides (L.) Gouan. Yewow or Smai,i< Ai,yssum. 

 (Man. p. 466 ; I. F. /. 7757.) In fields, Ont. to N. J. and Iowa. Also in 

 the far West. Nat. or adv. from En- — Pennsylvania : PiKE ; North- 

 ampton; Al,l,EGHENY. 



21. KONIGA Adans. 



1. Konlga maiitlma (L.) R.Br. SwEBT Alyssum. (Man. p. 466; I. 

 P. /. 1788.) In waste places, escaped. Adv. from 'Ba.— Pennsylvania : 

 Northampton ; Lancaster. 



22. BERTEROA DC. 



1. Berteroalnoana (L.) DC. Hoary Ai,yssum. (Man. p. 466; I. 

 P. / ^789.) In waste places, Me. to Mass., N. J. and Mo. Adv. or nat. 

 from Eu. — Pennsylvania : Phii,adei,phia, ballast. 



23. DRABA L- 



Petals 2-cleft : pods elliptic to oblong-elliptic. 1. D. verna. 



Petals entire : pods linear. 2. D. Caroliniana. 



1. Draba verna ly. Vernai< Whiti,ow-grass. (Man. p. 460 ; I. P. 

 /• ^755-) In fields, throughout northern U. S. Nat. from Eu. Also in 

 B. C. — Pennsylvania : Northampton ; Bucks ; Lancaster ; ■ Dela- 

 ware ; Chester ; Allegheny. 



2. Draba Caroliniana Walt. Carolina Whitlow-grass. (Man. p. 

 460; I. P. /. 1756.) In sandy fields, Mass. to Ont., Minn., Ga. and Ark. 

 — Pennsylvania : Bucks ; Lancaster. 



24. CARDAMINE L. 

 Leaf-blades, at least those of cauline leaves, pinnately divided. 

 Stems scape-like : leaves basal or mainly so. i. C. hirshta. 



Stems leafy. 

 Pods erect, less than i mm. broad. 

 Corolla 4 mm. wide or broader. 

 Sepals about 2 mm. long, ■ 2. C. Pennsylvanica. 



Sepals about i mm. long. 3. C. arenicola. 



Corolla 3 mm. wide or narrower. 4. C. parviflora. 



Pods spreading or ascending, over i mm. broad. 5. C. flexuosa. 



Leaf-blades entire or undulate. 

 Stems erect from a tuberous base. 

 Corolla purple. 6. C. purpurea. 



Corolla white. 7. C. bulbosa . 



Stems decumbent from a creeping base. 8. C. rolundifolia. 



1. Cardamlne hirsuta L. Hairy Bitter-cress. (Man. p. 454 ; I. 

 P. f. 1725. ) In moist places, Pa. to Mich, and N. C. Also in Eu. and 

 Asia. — Pennsylvania : York, above Wrightsville. 



2. Cardamlne Pennsylvanica Muhl. Pennsylvania Bitter-cress. 

 (Man. p. 454 ; I. V.f. 1726.) In swamps and wet places, Newf. to Minn., 

 Pla., Tenn. and Mo. — Pennsylvania: Monroe ; Northampton ; Bucks ; 

 Pranklin ; Lebanon; Sullivan ; Clarion ; Delaware; Allegheny. 



