164 THE FLORA. 
S, pinnatif‘ida. A prostrate, weed-like plant, common at the South, in flelds and on 
river-banks. Leaves divided in a pinnate manner, into oblong, toothed lobes, 
Flowers obscure, with scarcely any petals. Silicles flattened, notched at apex, 
wrinkled on the surface. Feb.-Suly. 
6. DRA’BA. Whitlow-grass. 
Calyx equal at base. Petals equal. Filaments without teeth. Silicle 
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. 896.) 
§ Petals 2-cleft, white. Leaves all radical....1 
§ Petals entire or merely notched. Stems more or less leafy....a 
a Style present. Plants perennial....2, 8 
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. 896.) 
2 D.arabi’sans. Mock W. Leaves minutely toothed. Silicle twisted, longer than 
the pedicel, oblong-lanceolate, 4-6’” long. Lake shores. (Figs. 155-159.) 
8 D.ramosis’sima, Bushy W. Leaves with remote and slender teeth. Silicle as 
long as its pedicel, style half as long. Flowers white. Rocks. 
4 D.nemora’lis. Wood W. Petals notched at end. Pod half as long as ita 
pedicel. Seeds near 30. Flowers yellowish-white. N-W. 
4D. brachycar’pa. Short-fruited W. Petals entire. Pod as long as pedicel, 
10-12-seeded. Leaves round-ovate. S.W. March, April. 
5 D. Carolinia’na. Leaves round-ovate, entire. Pods linear, in a sort of corymb. 
Flowers white. Plant hispid, 1-8’ high. E. 8. | April-June. 
6 D. cuneifo’/lia, Wedge-leaved W. Leaves wedge-oblong. Pods lance-oblong, 20- 
80-seeded, racemed. Plant 8-8’ high. 8-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. Flowers 
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 Siliques longer (1-2%), straight or curved. Seeds not winged....5, ¢ 
a Siliques long (3’), curved, hanging. Seeds winged....7, 8 
