13S 



TETRADYNAMIA SILICULOSA. 



Root annual. Stem erect^ with expanding branches^ sliglitlj^ angled to^ 

 wards the summit- Leaves akernatCj not glaucous^ the upper ones huice- 

 olate^ the lower almost hastate. Floivers in terminal racemes^ but forming^ 

 corymbose clusters when they first begin to expand ; common peduncle 1 



3 iuches; the partial 2 



3 lines long. 



Calyx 4-leavedj deciduous; leaf- 

 lets linear lanceolate^ slightly gibbous at base. Corolla crucifcrm. Pe- 

 tab 4y obcordate^ white^, with claws a little longer than the calyx. Fila- 

 ments 6^ of which 2 are shorter than the others. Germ superior^ slightly 



Glands 



Stigma thick. 



compressed^ jointed below the middle. Style 0. 

 4. two at the base pf the shorter filaments, and one between the base of 

 each longer pair. Pod 2-jointedj without valves. Seed 1 in each joint, 

 pval^ glabrous. 



Grows in the drifting sands along the margins of t^e ocean. Cultiva- 

 ted sometimes for the table, and much commended. 

 Flowers April — July. 



DRABA. 



>. 



G 



EN. 



L. 1076. 



Siliciila integra, o- 

 vali-oblonora, valvis 



Pod 



entire 



^ 



oval 



planiujsculis, 



piento parallelis. 



dissepi 





oblong; valves some- 

 what fiat, parallel with 

 the partition. 



1. 



AROLINIANA. 



D. foliis ovali-lan 

 ceolatis, hirsiitissimis 

 ramulis floriferis nu 



5 



dis 



J 



silieulis 



loRgo- 



linearibus^glabris, ap 



Leaves oval lance 



olate, 

 flower 



very 



hairy ; 



earing stems 



naked ; pods linear 



J 



proximatis 



glabrous 

 mate. 



> 



approxi- 



Walt. p. 174. Nutt. 2. p. 62. 



D. hispidula. Mich. 2. p. 28. . Pursh 2. p. 433 



Root annual. Stem very short, covered like the leaves with a stellular 



branches 



on the stem^ small^ more or less acute, and covered with a stellular pubes- 

 cence. Flowers on the summit of the branches. Calyx 4 leaved, deci- 

 duous. Corolla 4-petalledj oblong, with a base tapering to a claw, white, 

 in the later florets probably wanting. Stamem half as long as the petals. 

 Style very sliort. Stigma quadrifid. Pod 3—4 lines long, linear lanceqr 

 late. Seeds many. Dissejnment generally persistent. 



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