﻿( 159 .) 



A'RABIS* * 



Linnean Class and Order. Tetradyna'mia f, Siliquo'sa 



Natural Order. Cruci'fera§, Juss. Gen. PI. p. 237. — Sm. 

 Gram, of Bot. p. 138. Engl. FI. v. iii. p. 153. — Rich, by Macgilliv. 

 p. 498. — Cruci'ferae ; subord. Pleurorhi'zeae|| ; tribe, Ara- 

 bi'de.e^I* Bind]. Syn. pp. 20 & 22. ; Introd. to Nat. Syst of Bot. 

 pp. 14 to 18. — Loud. Hort. Brit. pp. 498 & 499.; Mag. of Nat. 

 Hist. v. i. pp. 143 & 239. — Rosales ; subord. Rhceadoste ; sect. 

 Rhaeadin a: ; type, Brassicaceae ; subty. Arabida: ; Burn. Outl. 

 of Bot. pp. 614, 784, 847, 854, & 856. — Siliquosas, Lirm. 



Ge.v. Char. Calyx (fig. 1.) of 4 upright, egg-oblong, converg- 

 ing, deciduous sepals, the two opposite ones rather the largest, 

 and somewhat protuberant at the base. Corolla (fig. 2.) cruciform, 

 of 4 inversely egg-shaped, entire, somewhat spreading petals, 

 which taper at the base into broadish claws, nearly as long as the 

 calyx. Filaments (fig. 4.) 6, thread-shaped, upright, simple, un- 

 connected, usually with 4 glands at their base externally. Anthers 

 roundish-heart-shaped, incumbent. Germen (fig. 3.) cylindrical, 

 about the length of the stamens. Style very short, or none. Stigma 

 blunt, simple. Pod ( siliquaj strap-shaped, compressed, very long, 

 crowned with the permanent stigma ; valves almost flat, ribbed, or 

 veiny, slightly undulated from the protuberance of the seeds, quite 

 as long as the strap-shaped, membranous partition. Seeds (fig. 5.) 

 oval, or orbicular, compressed, with or without a border, in 1 row 

 in each cell. Cotyledons (figs. 6 & 7.) flat, accumbent, o=. 



The strap-shaped pod, with flat, veiny or nerved valves ; and the 

 seeds in a single row, with flat accumbent cotyledons ; will distin- 

 guish this from other genera in the same class and order. 



Six species British. 



A'RABIS TURRI'TA. Tower Wall-cress. Tower-mustard. 

 Great Turkey-pod. 



Spec. Char. Leaves clasping the stem, rather acute, toothed, 

 pubescent. Flower-stalks the length of the calyx, each with a 

 leafy bractea. Pods all on one side, strap-shaped, flat, thick .edged, 

 recurved. 



Engl. Bot. t. 178.— Hook. FI. Lond. 1. 176.— Jacq. FI. Aust. t. 11.— Linn. Sp. 

 PI. 930.— Muds. FI. Angl. (2nd ed.) p. 293. — Sm. FI. Brit. v. ii. p. 714. Engl. 

 FI. v. iii. p.214.- With. (7th ed.) v. iii. p. 780.— Lindl. Syn. p. 24.— Hook. Brit. 

 FI. p. 303. — Sibth. FI. Oxon. p.20.5. — Relli. FI. Cantab. (3rd ed.) p.270. — 

 Purt. Mid. FI. v. iii. p. 57.— Hook. FI. Scot. p. 200.— Walk. FI. of Oxf. p. 193. — 

 Don’s Gen. Syst. of Gaid. and Bot. v. i. p. 165. — Curt. Brit. Entomol. v. ii. t. 

 74 I — Arabis major, Gray’sNat. Air. v. ii. p. 676.— Turritis major, Johnson’s 

 Gerarde, p. 272. 



Fig. 1. Calyx.— Fig. 2. Calyx and Corolla.— Fig. 3. Germen.— Fig. 4. Sta- 

 mens. — Fig. 5. A Seed. — Fig. 6. A Seed, with the Testa removed to show the 

 Cotyledons. — Fig. 7. The same a little magnified. 



* Originally from Arabia, but this name is not very precise, as the species of 

 the genus are found in many parts of the world, in arid, stony, and sandy places, 

 in cold and mild climates. Don. 



1* See Draba verna, f 38, n. f. $ See Ery'simum cheiranthoides, f.62, n. |. 



<5 See Draba verna, f. 38, a. || See Cardamine pratensis, f. 141, n. ||. 



IT From Arabis, and idea, shape of a thing ; plants agreeing with Arabis 

 in important characters. Don. 



