CRUCIFERAE. XXV. Apyseron. XXVI. Aryssum. 
from 4. montànum, to which species it is nearly allied in the pods 
being elliptical, not orbicular. 
Wulfen’s Adyseton. FI]. May, Sept. Clt. 1821. Pl. + foot. 
24 A. Sier’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. %. H. Native of Siberia. Flowers small. 
Siberian Adyseton. PI. 4 foot. 
25 A. FISCHERIA' NUM (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. %¥.H. Native of Siberia 
about Nerschtinsky-savod. Petals double the length of the calyx. 
Fischer’s Adyseton. P1.+4 foot. 
26 A. GNAPHALO DES (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. h. H. Native of Persia on Mount Elwend. Petals 
obovate, with filiform claws. 
Woolly Adyseton. Fl. May, Oct. Pl. 4 foot. 
27 A. PETALO ves (D.C. syst. 2. p. 312.) stems 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. kh.H. Native of 
Syria. Claws of petals longer than the calyx. 
Long-clawed-petalled Adyseton. Fl. May, Aug. PI. 4 foot. 
Secr. II. Oponroste mon (from odove odorroc, odous odontos, a 
tooth; ornuwy, stemon, a stamen ; each large stamen furnished 
with one tooth). Flowers white. Larger stamens furnished with 
atooth. Stems herbaceous. This section may probably form a 
distinct genus. 
28 A. HYPERBOREUM (Lin. spec. 910.) stems herbaceous, 
tufted; leaves elliptical, grossly and acutely toothed, rather 
hairy ; pods elliptical. %. H. Native of the western coast of 
North America among rocks.. Draba hyperborea, Desv. journ. 
bot. 3. p. 172. Krasch. noy. comm. acad. Petrop. 1. ann. 
1750. p. 388. t.15. f.1. A tufted, somewhat glaucous plant 
with the habit of Neurolòma arabiflòrum. Petals white, with 
yellow claws. Seed kidney-shaped, margined, 3 in each cell. 
Northern Adyseton. Fl. April, May. Pl. 2 inches. 
+ Species not sufficiently known. 
29 A. oxpcorpa'tum (D. C. syst. 2. p. 324.) leaves linear- 
lanceolate, toothed, woolJy-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. Pl. 4 foot. 
30 A. penta‘rum. (Nutt. gen. amer. 2. t. 63.) radical leaves 
somewhat runcinately-toothed ; cauline ones linear-lanceolate ; 
pods elliptical, pubescent. %. 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.? pu‘srum (Bory. ann. sc. phys. 3. p. 4.) stem shrubby, 
branched ; leaves obovate-lanceolate, downy ; pods ovate, acute, 
l-seeded. h.H. Native of Spain among the rocks of Sierra 
Nevada. A. purpureum, Lag. ann. 5. p. 275. 
Doubtful Adyseton. Pl. 2 or 4 inches. 
Cult. The whole of the species of: ddyséton 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 
179 
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 Avoca, lyssa, rage ; 
the 4lyssum 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, Siliculosa. 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. umeBELLA 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. ©.H. Na- 
tive of Tauria in gravelly places. A. brachystachyum, Bieb. 
suppl. 454. Flowers small, sulphur-coloured. 
Umbellate-racemed Madwort. Fl. Ju. Jul. Clt. 1817. Pl. 4 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. ©. 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. 3, A. vernale; Kit. from Horn. hort. hafn. p. 601. 
leaves linear, about a line in breadth. 
Beaked Madwort. Fl. May, Jul. Clt.1818. Pl.3 to 1 ft. 
3 A. micropr’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. ©. H. Native of 
Iberia near Tiflis. Deless. icon. sel. 2. t. 39. A. parviflora, 
Bieb. suppl. p. 434. 
Var. B, proctmbens (Bieb. l. c.) stems diffuse, procumbent, 
and much smaller. . 
Small-petalled Madwort. Fl. May, Jul. Clt. 1820. Pl.4 to} ft. 
4 A. nirsu‘rum (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 4. campéstre. Deless. icon. sel. 2. t. 40. 
Hairy Madwort. Fl. May, Jul. Cit. 1817. Pl. 4 to $ foot. 
5 Å. CAMPE'STRE (Lin. spec. 809.) 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. grec. t. 
626. Meenchia campéstris, Roth. fl. germ. 1. p. 274. Petals 
longer than the calyx, somewhat emarginate. 
Var. P, simplex (Rud. in Schrad. journ. 2. p. 291.). 
Field Madwort. Fl. June, Aug. Clt. 1768. Pl. 4 to 4 ft. 
6 A. caryci'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. ©. 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- 
péstre, Hoffm. germ. 4. p. 43. Schkuhr. handb, 2. t. 181. 
Petals, when old, whitish. 
Large-calyxed Madwort. Fl. June, Aug. Clt. 1740. Pl. 4ft. 
7 A. minu rum (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 
AaR 
