CEtrCIFEBJB. 97 



1. Common Cameline. Camelina sativa, Crautz. 

 (Alyssim, Eng. Bot. t. 1254. C. fostida, Bab. Man. Gold of Pleasure.) 

 Stem simple, or slightly branched, 1 to 2 feet high. Lowest leaves stalked, 

 upper ones sessile, clasping tlie stem with pointed auricles, lanceolate, en- 

 tire or toothed, 1 to 2 inches long. Pods about 3 lines long, on pedicels 

 about t-wice that length, in a long, loose raceme. 



In cultivated and waste places, in central and southern Europe, and the 

 temperate parts of Russian Asia ; further north only as a weed of cultiva- 

 tion. In Britain, appearing occasionally in corn and flax fields in England 

 and Ireland. FL tvith the corn. 



XVII. A-WL-WORT. SUBULARIA. 



A dwarf aquatic annual, with the pod of a Draba, but the valves more 

 convex, and the radicle incumbent on tlie back of the cotyledons, which are 

 linear, and the bend is, as in Senehiera, above the base of the cotyledons, 

 not at their junction with the radicle, as in the rest of Crucifers. 



The genus is hmited to a single species. 



1. ^^ater AT^Wort. Subularia aquatica, Linn. 

 (Eng. Bot. t. 732.) 



The whole plant is but 1 to 2, rarely 3, inches high, and perfectly glabrous, 

 usually gi-owing entii-ely under water. Leaves all radical, nearly cylindrical, 

 slender and pointed, ^ to 1 inch long. Flowers few, witli minute white 

 petals. Pods about a line and a half long, and oblong, or sometimes 

 shorter, and nearly globular, with 5 or 6 seeds in each cell. 



In the shallow edges of alpine ponds and lakes, in northern Europe, 

 Asia, and America, and more rarely in central Europe. Scarce in Britain, 

 in the mountains of Scotland, north-western England, and north Wales. 

 FL summer. 



XVIIL PENNVCRESS. THLASPI. 



Annuals or low perennials, tlie leaves usually undivided, the upper ones 

 clasping the stem, the flowers small and white. Petals equal, or nearly so. 

 Pod orbicular or obovate, flattened laterally at right angles to the narrow 

 partition, the valves boat-shaped, their midrib or keel more or less ex- 

 panded into a green wing surrounding the pod. Seeds two or more in 

 each cell. Radicle accumbent on the edge of the cotyledons. 



A small genus, spread over Europe, northern and central Asia, and 

 north-western America, distinguished from Candyhift and Cress by having 

 more than one seed in each cell of the pod, from all others by the winged 

 pod. 



Pod (meluding the broad wing) orbicular, about 6 lines broad ... 1. Field F. 

 Pod obovate or obeordate, not 3 lines broad. 



Biennial or perennial. Pod longer tlian broad, with 6 or 8 seeds 



in each cell 3. Alpine P. 



Annual. Pod nearly as broad as long, with about 4 seeds in each 



cell 2. Ferfoliate P. 



K 



