cxx CLASSES, &c. AND GENERA ARRANGED. 



Order II. SILIQUO'SA. Fruit, a long pod, with numerous 



seeds. 



* Cotyledons flat, accumbent} 



Cheiranthus, Wall-flower. Cal. closed, two of its leaflets promi- 

 nent at the base. Stig.-lohes, two spreading ones, or headed, 

 (capitate.) Pod somewhat compressed, straight. — Page 192. 



Nastu'rtium, Cress. Cal. spreading, equal at the base. Stig, 

 blunt, notched. Pod almost cylindrical, (sometimes short;) 

 valves hollow, (concave,) not keeled, nor nerved. — Page 188. 



Barbare'a, Winter-cress. Cal. upright. Stam.-glands between 

 the shorter filaments. Pod four-cornered, somewhat two-edged. 

 Seeds in a single row. — Page 191. 



'Arabis, Wall, or Rock-cress. {Cal. erect.) Pod linear ; valves 

 flat. Seeds in one row. — Page 193. 



Turri'tis, Tower-mustard. Pod linear, and (lengthened out;) 

 valves flat, keeled. Seeds in two rows. — Page 194. 



Carda'mine, Ladies' Smock, or Cuckoo-Floiver. Pod linear; 

 valves flat, nerveless, generally separating elastically from the 

 base. Seed-stalks slender. — Page 187. 



Denta'ria, Coralwort. Pod narrow-spear-shaped ; valves flat, nar- 

 rower than the partition, nerveless, generally separating elasti- 

 cally. Seed-stalks broad, flat. — Page 187. 



* * Cotyledons flat, incumbent.^ 



Sisy'mbrium, Hedge- Mustard. Pod nearly cylindrical. Stigma 

 headed, notched. Cal. spreading, sometimes erect. — Page 190. 



He'speris, Dames-violet. Cal. closed, with two protuberances at 

 the base. Stig. nearly stalkless, of two converging, (approach- 



' Cotyledons flat, accumbent, i. e. embryo-rootlet lying sideways, along the 

 chink, made by the cotyledons. In this case the embryo rootlet is in the same 

 line, (or nearly so,) with the two cotyledons. Not unlike the blade of a clasp 

 knife, slightly open ; tiie blade representing the embryo-rootlet, and the hollow 

 handle the two accumbent cotyledons. Cotyledons flat, incumbent, i. e. the 

 embryo-rootlet, lying over the middle of the back of one of the incumbent 

 cotyledons. Three leaves of a cut book, would represent the positions ; for 

 example, the two bottom leaves of the book would represent the positions of 

 the two incumbent cotyledons, and the remaining topmost third leaf, would 

 represent the position of the embryo-rootlet upon, or under the two cotyledons. 

 The seeds of the common garden candy tuft, (Iberis,) afford an easy example of 

 accumbent cotyledons : the seed of Lepidium campestre, of incumbent cotyledons. 

 The seeds of Rdphanus Raphanistrum, of folded cotyledons. The outer skin of 

 the green, full grown seeds should be carefully stripped off with a needle : 

 they may be examined with the microscope, or with the naked eye. R. VV. 



2 In the case of incumbent cotyledons, the back of one of the cotyledons is ap- 

 plied to the curved radicle ; in the case of accumbent, the edges of the cotyledons 

 are applied to it. — Baxter. See Plate, 184, &c- 



