480 BRASSICACEAE 



tlian tlie stems, simple or branched, 5-25 cm. high : racemes elongated : pedicels spreading 

 or somewhat ascending, 4-9 mm. long : sepals oblong, about 1.5 mm. long : petals white : 

 pods elliptic, 6-7.5 mm. long, finely pubescent. 

 In dry soil, Texas to Arizona. Spring. 



7. Draba brachycdrpa Nutt. Annual, thinly pubescent with stellate hairs. Stems 

 simple or usually branched at the base ; branches erect or ascending, 2-20 cm. long, leafv 

 to the racemes : leaves 5-15 ram. long ; blades oblong or oblong-lanceolate, or the basal with 

 ovate to obovate blades : racemes narrow, 1-10 cm. long, pedicels 1-3 mm. long, ascending 

 or nearly divaricate : sepals oval or oblong, less than 1 mm. long : petals white, longer 

 than the sepals or wanting : pods oblong, about as long as the pedicels, glabrous, acute. 



In fields and dry soil, Virginia to Missouri, Georgia and Texas. Spring. 



8. Draba ramosissima Desv. • Perennial, more or less densely pubescent with stellate 

 hairs. Stems decumbent or ci-eeping, the branches erect, 1-3 dm. tall, simple below, corym- 

 bose above : leaves mainly basal ; blades narrowly oblong, oblanceolate or cuneate-oblance- 

 olate, 1-4 cm. long, acute, remotely dentate with spreading teeth : racemes in terminal 

 corymbs : pedicels ascending, 5-10 mm. long : sepals oblong-lanceolate, 3 mm. long, obtuse : 

 petals white, spatulate, about thrice as long as the sepals, rounded at the apex : pods nar- 

 rowly oblong, 5-12 mm. long, spirally twisted at maturity, acuminate. 



On cliffs or rocky banks, Virginia to Kentucky, North Carolina and Tennessee. Spring. 



20. DENTARIA L. 



Erect scapose herbs, perennial by horizontal rootstocks. Leaves basal. Bracts usually 

 similar to the leaves, opposite or 3 or 4 in a whorl or approximate above the middle of the 

 scape : blades palmately cleft or 3-divided, the segments toothed or incised. Flowers per- 

 fect, in terminal racemes or corymbs. Sepals 4, equal at the base. Corolla white or purple : 

 l^etals with spreading blades and slender claws. Stamens 6. Ovary sessile : style slender : 

 stigma entire or rarely 2-lobed. Ovules numerous. Pods elongated, flattish or nearly terete, 

 the valves nerveless, or with a faint midnerve, elastically dehiscent from the base. Seeds 

 in 1 row in each cavity, not margined, somewhat flattened. Cotyledons accumbent. The 

 plants flower in the spring. Toothwort. 



Blades of basal and stem-leaves similar. 

 Leaf-segments linear. 



Leaf-segments 1-2-parted. 1. D. multifida. 



Leaf-segments entire, toothed or merely incised. 2. D.f areata. 

 Leaf-segments not linear. 



Rootstocks tuberous, moniliform, not scaly : leaf-segments laciniate. 3. D. laciniata. 

 Rootstocks elongated, continuous, scaly : leaf-segments toothed or incised. 



Leaf-segments incised, with narrow, very acute, often flaring teeth. 4. D. incisa. 



Leaf-segments not incised, with broad, blunt or merely mucronate teeth. 5. D. diphylla. 



Blades of basal and stem-leaves very dissimilar. 6. D. hcterophylla. 



1. Dentaria multifida Muhl. Rootstocks continuous. Foliage glabrous or nearly 

 so : leaves nearly 3-foliolate, with long petioles and once or twice pinnately parted segments, 

 the ultimate segments linear, entire or sparingly toothed : scapes erect, 2-3 dm. tall, 

 simple: bracts 2, with short petioles, and blades similar to those of the leaves : pedicels 

 ascending, 1.5-2 cm. long: sepals oblong, 5-6 ram. long, obtuse: petals white, almost 

 twice as long as the sepals : pods slender, ascending, 3 cm. long, long-beaked. 



In rocky woods. North Carolina to Tennessee, Georgia and Alabama. 



2. Dentaria furcata Small. Rootstocks moniliform. Foliage sometimes pubescent : 

 leaves with long petioles and 3 linear entire toothed or merely incised segments : scapes 

 erect, 2-3 dm. tall, simple : bracts 3, the blades similar to those of the leaves : pedicels 1-2.5 

 cm. long: sepals oblong to oblong-lanceolate, 5-6 mm. long: petals pink or whitish, 12-14 

 mm. long : pods narrowly fusiform, fully 3 cm. long, the slender beak nearly 1 era. long. 



In moist or rich woods, Ohio to Tennessee and Alabama. 



3. Dentaria laciniata Muhl. Rootstocks jointed. Foliage glabrous or sometimes 

 finely pubescent : leaves with long petioles and 3 linear-lanceolate or oblong coarsely ser- 

 rate or incised segments : scapes erect, 1-3.5 dm. tall : bracts 3, the blades similar to those of 

 the leaves : pedicels ascending, stout, 1-2 cm. long : sepals oblong, 5-6 mm. long, obtuse: 

 petals ])ink or purple, twice or thrice as long as tiie sepals : pods slender, 3-5 cm. long, 

 long-beaked. 



In woods, Quebec to Minnesota, Florida and Louisiana. Pepper-root. 



4. Dentaria incisa Small . Rootstocks continuous, scaly. Foliage glabrous : leaves 

 with long petioles and 3 ovate or lanceolate segments conspicuously incised with narrow 



