CLASS XV. ORDER II. 269 



SILIQUOSA. 



290. ARABIS. 

 Arabis falcata. 3Ix. Sickle Pod. 



Leaves lanceolate, remotely toothed, sessile ; si- 

 liqiies pendulous, two edged, falcate. 



Stem two or three feet high, round, smooth. Leaves sessile, 

 mostly lanceolate with a few remote teeth; the lower ones 

 sometimes sagittate and clasping. Raceme terminal. Flowers 

 very small, white. Pods long and curved, resembling a crooked 

 sword blade, articulated to a knob at the end of the pedicel, 

 acute, flat, pendulous. — Woods, Chelsea beach island. — August. 



Arabis rhomboidea. Rhomhoidal Arabis. 



Leaves smooth, rhomhoidal, repand, or obsoletely 

 toothed, the lower ones on long petioles ; root tuberous. 



Root tuberous and farinaceous. The leaves which spring 

 from the root are generally heart shaped, the lower stem leaves 

 oblong or ovate, repand, obtuse, smooth ; the upper ones becom- 

 ing quite narrow. Flowers white, in a terminal raceme. Pe- 

 duncles smooth, slender. Calyx of four erect, obtuse leaves. 

 Petals roundish, unguiculate. Anthers sagittate with microsco- 

 pic glands at the base of the filaments. — Wet meadows, Roxbu- 

 ry. — May. — Perennial. 



291. RAPHANUS. 

 Raphanus- Raphanistrum. L. Wild Radish. 



Pods round, jointed, smooth, of one cell. L. 



A hardy weed, frequent in the gravel by road sides, but most 

 troublesome in cultivated fields. Stem branching, round, bristly, 

 glaucous. Leaves rough, lower ones lyrate, upper ones toothed. 

 Calyx bristly. Petals spreading, yellow, turning white as they 

 grow old, not unfrequently of a light blue. Pods erect, knobbed, 

 tapering, smooth, ending in a long beak. When dry, they are 

 striated, and abruptly contracted between the cells, which are 

 hard and somewhat bonv. On cutting the pod across between 

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