242 TETRADYNAMIA — SILICULOSA. [Crambe. 



Upon Ivy, in many parts of Ireland. Fl. July, Au:^. O? — Much 

 smaller than any of the preceding and more slender. Cor. not at all 

 tumid, upper lip unequally notched. 



5. O. rubra, Sm. (red Broojn-rape) ; stem simple, corolla 

 tubular its upper lip 2-lobed, lower one in 3 equal obtuse lobes, 

 stamens partially glanduloso-pilose, style glabrous. E. Bot.t. 

 1786, (bad.) Hook, in Fl. Land. N. S. t. 105. 



Frequent upon basalt and trap rocks in the Hebrides and adjacent 

 shores of the mainland. Near Kirkaldy. Cave hill near Belfast, Ire- 

 land. FL July, i; . 



** Bracteas 3 under each JJoicer. 



6. O. C(Brulea, Vill. {purple Broom-rape); stem simple, 

 bracteas 3, upper lip of the corolla cloven and notched, lower 

 in 3 equal entire segments, style downy. E. Bot. t. 423. 



Grassy pastures near the sea; rare : principally found in Norfolk. Fl. 

 July. 1^, — More inclining to purplish-blue than any of the preceding. 



7. O. ramosa, L. (branched Broom-rape); stem branched, 

 bracteas 3, upper lip of the corolla deeply cloven, lower equally 

 3-lobed, segments all rounded and entire. E. Bot. t. 181. 



On hemp-roots, chiefly in Norfolk and Suffolk. Sark. Fl. Aug. 

 Sept. 0. 



CLASS XV. TETRADYNAMlA.i Q Stamens,^ long 

 and 2 short. — [ISlat. Ord. Crucifer^, Juss.) 



ORD. I. SILICULOSA. Fruit a short pod or pouch. 



1. CAKfLE. Po?<c^ angular, of 2, 1-seeded, indebiscent joints; 

 the upper joint deciduous, bearing an upriglit, sessile seed, the 

 lower one (sometimes abortive) pendulous. Cotyledons accum- 

 bent (o=). — Name, — an old Arabic word, applied probably to 

 this or some allied genus. 



2. Crambe. Pouch with the upper joint globose, indebiscent, 

 deciduous, bearing one inverted seed, upon a stalk arising from 



1 From TiT^x,, 4, and hjvocfzn, a power, or superiority in length of 4 over the 

 other 2 stamens. Tliis Class is a most natural one, entirely corresponding 

 with the CauciFERiEof Juss. The Ca/;/.T is of 4 pieces ; the Corolla of 4 Petals, 

 placed in a cross-shaped manner. Pistil single. Fruit either a short pod or 

 pouch, Siliciila ; or a luiiff pod, Silitjiia; from which rather arbitrary distinction, 

 the characters of the two Orders are drawn. In every extensive natural group 

 the difficulty is great in defining the generic characters. So it is here, and they 

 are mainly depending upon the/r«?<. Even the Embryo is taken into account. 

 It is curved ; the radicle is turned upwards, and is either dorsal, originating 

 from the back of, and applied to, one of the cotyledons ( ()|| ), hence Cotyledons 

 incumbent; or lateral atul applied to the two edges of the cotyledons (^O:^), 

 whence Cotyledons accumbent. The seed being without albumen and readily 

 removed from the skin or integument (especially if examined before it is 

 perfectly ripe), facilitates the investigation of the embryo. — [ have adopted, 

 with few alterations, Mr Brown's arrangement and character of the Genera 

 in the Hort. Ketv. erf. 2. 



