282 CRUCIFERAE 
2. §. Sophia, L. Frtxweep. Hers Sopnta. (Sophia Sophia, Brit- 
ton.) Herb 1 to 23 ft. high, hairy, with forked hairs. Stems slender, 
branching. Leaves doubly feather-formed. Flowers small. Pods 1 to 
2 in. long on slender foot-stalks. Naturalized. Waste places. June- 
August. 
3. §. altissimum, L. Tat Sisymprrum. Stem 2 to 4 ft. high, slen- 
der, branching, not hairy or with few hairs. Leaves feather-formed. 
Flowers small. Pods 2 to 4 in. long, very slender, spreading. Waste 
places. Naturalized. 
4. §. humile, Meyer. Low or Nortuern Rock Cress. Stem 4 to 
10 in. high. Rosette of leaves lance-shaped with sinuses or dentate edges. 
Stem leaves linear. Pod slender. Flowers white or pink. Rocky places; 
mountains of Vermont, rare. July. 
16. RAPHANUS, L. 
Erect, branching. Leaves somewhat hairy, long, cut by deep sinuses. 
Fruit pods not hairy, constricted between the pods, with a long style. 
1. R. Raphanistrum, L. Witp Rapisu. Plant 1 to 23 ft. high, 
somewhat hairy. Leaves lyre-shaped, rough; pod tapering at apex to a 
long style, necklace shaped from the constrictions between the ceeds. 
Naturalized. Fields. 
2. R. sativus, L. GarpEN Rapisu. The garden radish with pale pur- 
ple petal is sometimes found persistent in old fields. 
17. DIPLOTAXIS, DC. 
Plants smooth or nearly so. Leaves long, in general form lance-shaped 
but cut by sinuses into feather-form. Pod long, somewhat flattened, beak 
short or absent. 
I. D. tenuifolia, (L.) DC. (Fig. 7, .pl. 55.) Warn Rocsen~ 2& 
bushy plant 1 to 4 ft. high, with leaves cut almost to the mid-vein by 
the numerous deep sinuses. The lower leaves 3 to 6 in. long, the lobes 
generally narrow and the sinuses broad. Fruit pods long and slender on 
slender foot-stalks about 1/3 the length of the pod. Stems leafy up to 
the loose cluster of flowers. Introduced. Waste places. Summer. 
2. D. muralis, (L.) DC. Sanp Rocker, Plant resembling No, 1. 
The leaves of No. 1 are in general outline egg-shaped or long lanee- 
shaped, broadest near the center or at the anterior third. The leaves 
of this species are long and narrow the broadest part being near the 
apex. The sinuses are much more shallow than those of No. 1, the lobes 
being reduced almost to coarse teeth. The stem above is nearly or quite . 
leafless. 
18. RORIPA, Scop. 
Very leafy, branching herbs with lobed or dissected leaves. Flowers 
white in two of our species, yellow in all the others. Fruit pods short 
in most of the species, sometimes elongated in a few. Seeds in two rows 
in each valve of the pod. 
Flowers white 
Aquatic plants. 
Leaves mostly . trifollate 06) ss me tt boas) eye oe! Pau TIGSPY ENE 
Leaves dissected into thread-like divisions . . . . . .«. MR. americana 
Fupnts: “not. strictly “aquatic? 5° 5) i) vin jew islet cn eu on Pete ee POE 
