MUSTARD FAMILY 
43 
slender claws and ovate limb. Sepals short. Pod linear, flattened. 
(Latin dens, a tooth, the rootstocks toothed in some species.) 
1. D. integrifolia Nutt. Milkmaids. Stem stoutish, 2.8 dm. high; 
leaves thickish, those from the rootstock simple or 3-foliolate; stem leaves 
3-foliolate; leaflets roundish to ovate or the upper lanceolate; flowers 
white, 1.2 cm. broad.—Valleys, especially in heavy or adobe soil.—Var. 
californica Jepson. Taller and more slender; leaves larger, thinnish, 
sometimes 5-foliolate; corolla white or pale rose-color.—Shady woods. 
11. RADICULA Hill 
Annuals or perennials, growing in water or wet places. Flowers 
small, white or yellow. Sepals spreading. Petals scarcely clawed. Pod 
linear or oblong, round or nearly so. Seeds minute, in 2 rows in each 
cell. (Diminutive of radix, radish.) 
Leaves divided ; stems diffuse or ascending. 
Petals white, nearly twice as long as the calyx.1. R. nasturtium-aquaticuiu. 
Petals yellow, little longer than the calyx.2. R. curvisiliqua . 
Leaves undivided or only the lower pinnatifid; petal white, much longer than the 
calyx ; steins erect...3. R. armoracia. 
1. R. nasturtium-aquaticum Britt. & Rendle. Water Cress. Stems 
ascending, prostrate at base and rooting at the nodes; herbage glabrous; 
leaflets or segments 3 to 9, ovate or roundish, the terminal one largest, 
or the lowest leaves simple ; pods widely spreading, 1.2 to 2.4 cm. long, 
on pedicels about as long.—Springs and slow-flowing creeks; nat. from 
Eur. The young plants are used as salad. 
2. R. curvisiliqua (Hook.) Greene. Western Yellow-Cress. 
Stems diffuse, 7.2 to 16.8 cm. long; herbage sparsely hairy; leaves pin¬ 
natifid or pinnately parted into many broad or narrow segments which 
vary from entire to pinnatifid; pods linear, terete, more or less curved, 
5 to 14 mm. long, borne on pedicels 1 to 3 mm. long.—Beds of flood 
streams and former vernal pools. 
3. R. armoracia Robins. Horse-Radish. Stout perennial, 5 to 8.5 
dm. high, from a deep hard root; basal leaves large, oblong, crenate or 
pinnatifid ; stem leaves lanceolate or linear, entire or toothed ; pods globu¬ 
lar.—Cult, from Eur.; escaped in moist places and along water courses. 
The root furnishes a well-known condiment. 
12. ALYSSUM L. 
Low branching herbs with narrow leaves and white or yellowish 
flowers. Filaments with teeth or glands at base. Pods small, orbicular, 
with 1 or 2 seeds in each cell. (Greek a, without, lussa, madness, in 
ancient times an antidote for hydrophobia.) 
Pubescence consisting of stellate hairs; pods narrowly margined, slightly emargi- 
nate above..L A. alyssoides. 
Pubescence consisting of simple appressed hairs; pods marginless, pointed. 
2. A. maritimum. 
1. A. alyssoides L. Small Alyssum. Annual; petals yellowish 
white, scarcely exceeding the sepals which persist about the base of the 
f ru it.—Cult, in gardens and sometimes occurring as an escape; native of 
Eur. . 
2. A. maritimum (L.) Lam. Sweet Alyssum. Perennial; petals 
