cruc1fer.e 159 



Plate 68, 69. 

 DRABA, L. 



Silicula oblonga v. ovalis, plano-compressa, polysperma, 

 valvis septo lato parallelis complanatis. Semina compressi- 

 uscula immarginata. Cotyledones plana? accumbentes. Fi- 

 lamenta edentula, seepius complanata. 



Draba, Linn. Gen. 800. (excl. spec.) Schkuhr, Handb. t. 179. R. Br. 

 in Ait. Kew. ed. 2. 4. p. 91. Torr. & Gray, Fl. N. Am. 1. p. 103. 

 Draba <& Erophila, DC. Syst. 2. p. 331, 356. (excl. spec.) C. A. Mey- 

 er, in Ledeb. Fl. Alt. 3. p. 69. Endl. Gen. 4880, 4881. 



Whitlow-Grass. 



Calyx equal at the base •; the sepals erect or a little 

 spreading. Petals somewhat unguiculate ; the lamina di- 

 lated, entire, emarginate, or (in Sect. Erophila) two-lobed. 

 Stamens moderately tetradynamous : filaments mostly flat- 

 tened and more or less dilated towards the base, not toothed 

 nor with membranaceous appendages : anthers roundish or 

 oval. Ovary two-celled : style short or elongated : stigma 

 capitate or depressed, usually entire. Ovules 6 to 30 in 

 each cell in two series. 



Silicle varying from oval to linear-oblong, not stipitate, 

 sometimes twisted, compressed parallel to the broad and 

 mostly 1 - 2-nerved partition ; the valves flat with incurved 

 edges, one-nerved, or sometimes three-nerved, and minutely 

 veiny (areola? of the partition much as in Arabis). Seeds 

 6 to 30 in each cell, pendulous in two rows, on slender free 

 funiculi, oval or oblong, more or less compressed, not mar- 

 gined, smooth. Cotyledons parallel with the partition, 

 oval, rather thick, accumbent ; the radicle ascending on 

 the side remote from the placenta. 



Herbs low, of various aspect, with entire or toothed 

 leaves, the radical mostly rosulate, the cauline when present 

 sessile. Flowers yellow or white, in ebracteate racemes. 



