1G6 THE FLORA 



innatif'ida. A prostrate, weed-like plant, common at the South, in fields and , 

 river-banks. Leaves divided in a pinnate manner, into oblong, toothed lobe 

 Flowers obscure, with scarcely any petals. Silicles flattened, notched at ape 

 wrinkled on the surface. Feb.-July. 



6. DRA'BA. Whitlow-grass. 



Calyx equal at base. Petals equal. Filaments without teeth. Silicic 

 oval-oblong, entire, flattened parallel to the broad partition. Cells 2, 

 many-seeded. Seeds not margined. Low herbs, with small white or 

 yellow flowers in racemes. (See Fig. 396.) 



Petals 2-cleft, white. Leaves all radical 1 



Petals entire or merely notched. Sterna more or less leafy. . . .a 



a Style present. Plants perennial 2,3 



a Style none. Plants annual or biennial b 



b Pedicels as long or longer than the pod. . . .4, 5 

 b Pedicels shorter than their pods .... 



1 D.verna. Spring W. Leaves oblong, hairy. Scape 1-5' high. (See Fig. 396.) 

 2 D. arabi'sans. Rock W. Leaves minutely toothed. Silicic twisted, longer than 



the pedicel, ohlong-lanceolate, 4-6" long. Lake shores. (Figs. 155-159.) 

 8 D. ramosis'sima. Bushy W. Leaves with remote and slender teeth. Silicic as 



long as its pedicel, style half as long. Flowers white. Kocks. 

 4 D. nemora'lis. Wood W. Petals notched at end. Pod half as long as it 



pedicel.- Seeds near 30. Flowers yellowish-white. N-W. 

 4 D. brachycar'pa. Short-fruited W. Petals entire. Pod as long as pedicel, 



10-1'2-seeded. Leaves round-ovate. S. "W. March, April. 

 6 D. Carolinia'na. Leaves round-ovate, entire. Pods linear, in a sort of corymb. 



Flowers white. Plant hispid, 1-3' high. E. S. April-June. 

 6 D. cuneifo'lia. Wedge-leaved W. Leaves wedge-oblong. Pods lance-oblong, 20- 

 30-seeded, racemed. Plant 8-8' high. S-W. 



7. AR'ABIS. Rock Cress. Sickle-pod. 



Sepals erect. Petals clawed, entire. Silique linear, flattened, valves 

 one-veined in the middle. Seeds in a single row in each cell. Flowera 

 white. April-June. 



Leaves all (or at least the radical) pinnatifid 1, 2 



Leaves all undivided ; toothed or entire, often clasping. . . .a 

 a Siliques short (6-12") and straight. Seeds not winged.... 3, 4 

 a Si'.iques longer (1-2'), straight or curved. Seeds not winged.... 5, 6 

 Siliqnes long (S'), cuived, hanging. Seeds winged 7, 8 



