164 FLOBA OF PHILADELPHIA. 



20. BAPISTEUM Desv. 

 1. Bapjstrum ruoosum (L.) All. M. p. 460. Ballast and waste places- 

 Summer. 

 Philadelphia— Ballast (He.). Northampton — Eastern, Porter (B. C). 

 Camden — Kaighn's Point (He.). 



21. DRABA L. Whitlow-geass. 



Petals deeply 2-cleft. 1. D. verna. 



Petals entire, or rarely toothed. 2. D. Carolinians. 



1. Draba verna L. M. p. 460. Sandy places. Early spring. 



2. Draba Caroliniana" Walt. M. p. 460. Sandy fields. Spring. 



Bucks— Point Pleasant (Fr.). Lancaster— Lancaster (Ca.). 



Burlington— Burlington, I. Burk (He.). Camden— Cooper's Creel? near 

 Starrs, Mart. (B. C), Clementon (Br.). Gloucester— Swedesboro (Li.). 

 Cumberland — Vineland (Ab.). Middlesex—, South Amboy (C). Hunter- 

 don— B\Hl'a Island (C.)'. 



22. SOPHIA Adans. Hedge-mustard. 



Pods narrowly linear, 1.5-2.5 cm. long, 1 mm. wide, curved upward; pedicels 

 ascending. 1. S. Sophia. 



Pods linear-oblong, 5-14 mm. long, 1-2 mm. wide, straight or nearly .so. 



2. S. pinnata. 



1. Sophia Sophia (L.) Britton. M. p. 462. Waste places. Summer. 



Philadelphia— Philadelphia Salt Works, /. Burk (He.). 



Camden— Kaighn's Point (Ja.) .(Tie.) (Wn.). 

 .«. Sophia pinnata (Walt.) Britton. M. p. 462. Dry soil. Summer. 



Philadelphia — Ballast (P.). Chester^ — Banks of the Schuylkill, Dar- 

 lington (Fl. C). 



Cape May — Delaware Bay (C). Hunterdon — Bosemont (C). 



23. STENOPHRAGMA Celak. 



1. Stenophragma Thaliana (L.) Celak. Mouse-ear Cress. M. p. 463. Old 

 fields and rocks. Spring. 



24. ABABIS L. Bock-cress. 



Seeds in 1 row, or in 2 incomplete tows in each cavity of the pod. 



Basal leaves pinnatifid; pods ascending. 1. A. lyrata. 



Basal leaves merely dentate or lyrate. 

 Pods nearly erect, 1 mm. broad. 



Flowers white, 8 mm. broad; pods not appressed; style 1 mm. 



long. 2. A. patens. 



Flowers white or greenish-white, 4-6 mm. broad; pods ap- 

 pressed; style none. 3. A. hirsuta. 

 Pods recurved-spreading. 



Plant glabrous throughout. 4. A. laevigata. 



Leaves and lower part of stem hairy. 5. A. Canadensis. 



Seeds in 2 distinct rows in each cavity of the pod. 6. A. glabra. 



1. Ababis lyrata L. M. p. 463. Bocks and sandy shores. Spring and 



summer. 



2. Arabis patens Sulliv. M. p. 464. Rocky woods. Summer. 



Bucks— Bock Hill (Ja.). Montgomery— Ivy Rock (Le.) (Wn.)-. Dela- 



