CRUCIFER^E. XXV. ADYSETON. XXVI. ALYSSUM. 



179 



from A. montanum, to which species it is nearly allied in the pods 

 being elliptical, not orbicular. 



Wulfen's Adyseton. Fl. May, Sept. Clt. 1821. PI. $ foot. 



24 A. SIBI'RICUM (Willd. spec. 3. p. 465.) stems herbaceous, 

 ascendant, branched at the top, corymbose ; leaves and pods 

 obovate, blunt, dotted with stellate hairs ; style 3-times shorter 

 than the pod. Tf. . H. Native of Siberia. Flowers small. 



Siberian Adyseton. PI. 1 foot. 



25 A. FISCHERIANUM (D. C. syst. 2. p. 311.) stems herba- 

 ceous, ascendant, and are as well as the leaves grey, lower leaves 

 obovate, upper ones oblong ; racemes simple ; pods orbicular, 

 hoary, twice the length of the style. l/.H. Native of Siberia 

 about Nerschtinsky-savod. Petals double the length of the calyx. 



Fischer's Adyseton. PI. -j foot. 



26 A. GNAPHALODES (D. C. syst. 2. p. 311.) stems sufFruti- 

 cose, dwarf ; leaves elliptical, covered with velvety down, those 

 of the branches linear ; racemes simple ; calyx closed, longer 

 than the pedicel ; pods elliptical, velvety, twice the length of the 

 style. fy . H. Native of Persia on Mount Elwend. Petals 

 obovate, with filiform claws. 



Woolly Adyseton. Fl. May, Oct. PI. J foot. 



27 A. PETALO'DES (D. C. syst. 2. p. 312.) steins suffruticose, 

 erectish, hairy ; leaves oblong, narrowed at the base, hairy, lower 



. ones toothed ; racemes simple ; calyx closed, longer than the 

 pedicel ; pods ovate, with a velvety margin. Jj . H . Native of 

 Syria. Claws of petals longer than the calyx. 



Long-c\nv/ed-petalled Adyseton. Fl. May, Aug. PI. ^ foot. 



SECT. II. ODONTOSTE' MON (from odouc oSovros, odous odontos, a 

 tooth ; ctrrifiiav, stemon, a stamen ; each large stamen furnished 

 with one tooth). Flowers white. Larger stamens furnished with 

 a tooth. Stems herbaceous. This section may probably form a 

 distinct genus. 



28 A. HYPEUBO'REUM (Lin. spec. 910.) stems herbaceous, 

 tufted ; leaves elliptical, grossly and acutely toothed, rather 

 hairy ; pods elliptical. 1. H. Native of the western coast of 

 North America among rocks. Draba hyperborea, Desv. journ. 

 bot. 3. p. 172. Krasch. nov. comm. acad. Petrop. 1. ann. 

 1750. p. 388. t. 15. f. 1. A tufted, somewhat glaucous plant 

 witli the habit of Neuroloma arabiflorum. Petals white, with 

 yellow claws. Seed kidney-shaped, margined, 3 in each cell. 



Northern Adyseton. Fl. April, May. PI. 2 inches. 



f- Species not sufficiently known. 



29 A. OBCORDA'TUM (D. C. syst. 2. p. 324.) leaves linear- 

 lanceolate, toothed, woolly -pubescent ; pods smooth, roundish- 

 obcordate. Native? Aurinia obcordata, Desv. journ. 3. p. 162. 

 & 174. Seeds girded with a broad membrane, only one in 

 each cell. 



Obcordate-podded Adyseton. PI. foot. 



SO A. DENTA'TUM (Nutt. gen. amer. 2. t. 63.) radical leaves 

 somewhat runcinately-toothed ; cauline ones linear-lanceolate ; 

 pods elliptical, pubescent. It. H. Native of Virginia near 

 Harper's Ferry, on declivities of slate rocks. Draba arabisans, 

 Pursh, fl. amer. sept. 2. p. 434. but not of Mich. Flowers 

 unknown. 



Toothed-leaved Adyseton. PI. ? 



31 A.? DU'BIUM (Bory. ann. sc. phys. 3. p. 4.) stem shrubby, 

 branched ; leaves obovate-lanceolate, downy ; pods ovate, acute, 

 1 -seeded. (7 . H. Native of Spain among the rocks of Sierra 

 Nevada. A. purpureum, Lag. ann. 5. p. 275. 



Doubtful Adyseton. PI. 2 or 4 inches. 



Cult. The whole of the species of Adyseton are very proper 

 for ornamenting rock-work, or the front of flower-borders. Some 

 of the rarer species may be kept in pots, and placed among other 

 alpine plants. They may be increased by cuttings, planted under 



a hand-glass, or by dividing the plants at the roots as well as 

 by seed. A dry light soil suits them best. 



XXVI. ALY'SSUM (from a, priv. and \v<r<ra, lyssa, rage ; 

 the Alyssum passed among the ancients as a plant possessed of 

 properties of allaying anger). R. Br. in app. to Denh. and 

 Clapp. trav. p. 6. Alyssum spec. Lin. D. C. syst. 2. p. 301. 

 prod. 1. p. 162. 



LIN. SYST. Tetradynamia, Siliculbsa. Silicle roundish, with 

 the valves convex in the disk, retuse at the apex ; cells 2-seeded. 

 Seeds girded by a membranous wing. Funicle adhering to the 

 dissepiment, permanent. Petals emarginate. Stamens all or 

 some of them toothed. Annual branched herbs, grey from stel- 

 late down. Racemes terminal. Flowers small, yellow. 



1 A. UMBELLA'TUM (Desv. journ. bot. 3. p. 173. and 184.) 

 stem diffuse, leaves linear, rather hairy ; racemes somewhat um- 

 bellate ; pods elliptical, pilose with stellate hairs. Q. H. Na- 

 tive of Tauria in gravelly places. A. brachystichyum, Bieb. 

 suppl. 4S4. Flowers small, sulphur-coloured. 



Umbellatc-racemed Madwort. Fl. Ju.Jul. Clt. 1817. PI. | ft. 



2 A. ROSTRA'TUM (Stev. mem. acad. petersb. 3. p. 295. t. 15. 

 f. 1.) stem erect ; floriferous branches panicled ; leaves lanceo- 

 late, rather hairy ; pods orbicularly-elliptical, pilose, grey, 

 hardly longer than the style, disposed in long racemes. Q. H. 

 Native of Bessarabia, on the edges of fields about Bender ; on the 

 calcareous rocks at the river Tyra ; about Odessa, and in the 

 mountains of Tauria. Petals spatulate, dark yellow, twice the 

 length of the calyx. 



Var. j3, A.vernale; Kit. from Horn. hort. hafn. p. 601. 

 leaves linear, about a line in breadth. 



Beaked Madwort. Fl. May, Jul. Clt. 1818. PI. | to 1 ft. 



3 A. MICROPE'TALUM (Fisch. in D. C. syst. 2. p. 313.) stem 

 erect ; leaves lanceolate, hairy ; pods hairy, orbicular, twice as 

 long as the style, disposed in long racemes. 0. H. Native of 

 Iberia near Tiflis. Deless. icon. sel. 2. t. 39. A. parviflora, 

 Bieb. suppl. p. 434. 



Var. ft, procumbens (Bieb. 1. c.) stems diffuse, procumbent, 

 and much smaller. 



Small-petalled Madwort. Fl. May, Jul. Clt. 1 820. PI. | tof ft. 



4 A. HIRSU'TUM (Bieb. fl. taur. 2. p. 106.) stem erect; leaves 

 lanceolate, hairy ; pods orbicular, tuberculately-hairy, thrice as 

 long as the style, disposed in long racemes. H. Native of 

 Tauria and Iberia in dry fields. A. Draba, Willd. enum. p. 672. 

 Very like A. campestre. Deless. icon. sel. 2. t. 40. 



Hairy Mad wort. Fl. May, Jul. Clt. 1817. PI. -J to | foot. 



5 A. CAMPE'STRE (Lin. spec. 309.) stems diffuse ; leaves lance- 

 late or somewhat linear, hairy ; pods orbicular, tubercularly-hairy, 

 six times longer than the style, disposed in long racemes. 

 . H. Native of Spain, Tauria, south of France, Vallais, Italy, 

 Transylvania, Greece, &c. in sandy fields. Smith, fl. grsec. t. 

 626. Moe'nchia campestris, Roth. fl. germ. 1. p. 274. Petals 

 longer than the calyx, somewhat emarginate. 



Var. /3, simplex (Rud. in Schrad. journ. 2. p. 291.). 



Field Madwort. Fl. June, Aug. Clt. 1768. PI. | to | ft. 



6 A. CALYCI V NUM (Lin. spec. 908.) stems diffuse ; leaves linear- 

 lanceolate, canescent ; calyx permanent ; pods orbicular, some- 

 what emarginate, downy, 4-times as long as the style. 0. H. 

 Native in dry fields both in South and middle Europe. Jacq. vind. 

 114. fl. austr. t. 338. A. alyssoides, Gouan. hort. 321. A. cam- 

 pestre, Hoffm. germ. 4. p. 43. Schkuhr. handb. 2. t. 181. 

 Petals, when old, whitish. 



Large-calyxed Madwort. Fl. June, Aug. Clt. 1740. PI. ^ft. 



7 A. MINU'TUM (Schlecht. in herb. Willd. from Steven. D. C. 

 syst. 2. p. 316.) stems erectish, somewhat hispid; radical leaves 

 oval, stalked, cauline ones oblong-linear ; calyx pilose, slowly 



A A 2 



