DICOTYLEDONES — THALAMIFLOR^E. 397 



which largely ajBPord a milky, acrid, and narcotic juice, while 

 the seeds of all, except Argemone 3Iexicana, are mild and oleagi- 

 nous. — 1. Papa VER, />. 209. 2. IMeconopsis, />. 209. 3. Glau- 

 ciuM, /?. 209. 4. Chelidonium, />. 209. 



(Sarracenie^. a remarkable Order comprising one Genus, Sarra- 

 cenia, exclusively inhabiting bogs in N. America. The leaves are radi- 

 cal, long, tubular, with a helmet-like appendage ; they contain a fluid, 

 and are admirably contrived for decoying insects, the dead bodies of 

 which in the native country ulmost till the 'tubes. The flowers are 

 scarcely less curious than the loaves.) 



Ord. V. FUMARIACEiE. Sepals 2, deciduous. Petals 

 4, more or less united, one or two of them gibbous or spurred at 

 the base. Stamens 6, in two parcels. Ovary 1. Style filiform. 

 Stigma lobed. Fruit dry, indehiscent, with one or two seeds ; 

 or dehiscent with 2 valves and many seeds. Seeds glossy, with 

 an arillus or caruncle, and a fleshy albumen and embryo at the 

 base. — Herbs of temperate climates, ivitli brittle stems and ivatery 

 Juice, slightly bitter and diaphoretic. — 1. Fumaria, p. 262. 2. 



CORYDALIS,/?. 262. 



Ord. VI. CRUCIFERyE. Ca/y^of 4 sepals. Petals^. Sta- 

 mens 6, tetradynamous, alternate with the petals ; 2 solitary, 4 

 in 2 pairs. Ovary and Style 1 ; hypogynous glands at the base 

 of the stamens. Pericarp a. pouch or pod, 2- rarely 1 -celled, 2- 

 valved, sometimes valveless, many-seeded. Seeds on marginal 

 receptacles, without albumeii. Radicle curved upwards towards 

 the margin of the cotyledons (accumbent, o^=), or against the 

 back of one of them (incumbent, oj]). — Herbs. Leaves alter- 

 ?iate. Flowers generally in corymbs, ichich at length become ra- 

 cemes. — A most important Natural Order, many of the plants 

 which it contains being cultivated as esculents ; the Cabbage, 

 Turnep, 3Iustard, and Cresses of various kinds, Horse-radish, &c., 

 &c. They contain an essential oil, which renders them stimu- 

 lating, while their seeds yield a fine and mild oleaginous fluid, 

 as Rape ; and they are antiscorbutic. The 3Iustard-seed is used 

 for sinapisms. Several kinds contain sulphur and the basis of 

 ammonia, nitrogen.— The following arrangement of this Order 

 by Decandolle and others, from characters depending primarily 

 upon the plicature of the embryo, though it may in some re- 

 spects be more natural, is full of difficulties to the young stu- 

 dent, who, in innumerable instances, cannot be expected to have 

 access to the seed in a fit state for examination. The following 

 are the British Genera, thus arranged: 



Suborder I. PLEURORHIZ^. (o=) 

 Tribe I. ARABiDEiE. (^Pod elongated. Dissepiment narroio. Valves 

 Jlat or slightly keeled.) 1. Matthiola. 2. Cheiranthus. 3. 

 Nasturtium. 4. Barbare^. 5. Turritis. 6. Arabis. 7. 

 Caudamine. 8. Dentaria. 



