CRUCIFERZ. 
rica, in the kingdom of Quito, in the mountain Cotopaxi, at the 
height of 6600 feet. A’rabis andicola, H. B. et Kth. nov. spec. 
amer. 5 p. 81. Petals white, linear, blunt. Seeds innumerable, 
small, brown. 
Hispidish Tower-Mustard. Pl. 2 feet. 
4 T. méxuts (Hook. fl. bor. amer. p. 40.) erect ; lower leaves 
spatulate, sinuately-toothed, upper ones lanceolate, broadly-sa- 
gittate, quite entire, all as well as the stem and pedicels covered 
with numerous spreading soft hairs; siliques linear-elongated, 
erect. ©. H. Native of North America, on the shores of the 
Arctic Sea. Flowers white. 
Soft Tower-Mustard. Fl. May, Jul. Clt. 1826. Pl. 1 foot. 
5 T.srricra (Graham in edinb. phil. journ. July, 1829. p. 7. 
Hook. 1. c.) erect, smooth; leaves lanceolate, radical ones 
stalked, toothed, cauline ones sagittate, half stem-clasping, a little 
toothed, siliques linear-elongated, erect. ©. H. Native of 
North America, in prairies of the Rocky Mountains and about 
Fort Vancouver, on the Columbia. Flowers pure white. 
Straight-podded Tower-Mustard. Fl. Jun. Jul. Clt. 1826. 
Pl. 4 to 1 foot. 
6 T. pa’tuta (Graham, in edin. phil. journ. July, 1829. p. 7. 
Hook. 1. c. but not of Ehrh. or Willd.) erect ; leaves lanceolate, 
radical ones stalked, toothed, cauline ones sagittate, half-stem- 
clasping, smooth, and a little toothed ; flowers spreading, as well 
as linear-elongated siliques. ©.H. Native of North America. 
Flowers rather large, of a beautiful rose-purple colour. 
Var. a, subpubéscens ; radical leaves sparingly pubescent. 
Native from Canada to Lat. 68°., and from Hudson’s Bay to the 
Rocky Mountains, and even to Fort Vancouver, on the Columbia. 
Var. P, incana ; radical leaves hoary with pubescence. Na- 
tive on the highest summits of the Rocky Mountains. 
Spreading Tower-Mustard. Fl. Ju. July. Clt. 1826. Pl. 1 ft. 
7 T. rerrorra’cta (Hook. flor. bor. amer. p. 41.) plant 
erect, hoary-pubescent, or smooth; leaves lanceolate, radical 
ones stalked-toothed, cauline ones sagittate, half-stem-clasping, 
smooth, a little toothed ; flowers drooping ; siliques linear, elon- 
gated, and are, as well as the pedicels, bent backwards. ©. H. 
Native of North America, from Hudson’s Bay to the Rocky 
Mountains, and from Canada to Lat. 68°., at the Mackenzie 
River. A’rabis retrofracta, Graham, in edin. phil. journ. July, 
1829. Flowers white, with a faint purplish tinge.{ 
Retrofracted pedicelled Tower-Mustard. Fl. Ju. July. Clt. 
1826. Pl. 1 foot. 
8 T. pirru'sa (Hook. fl. bor. amer. p. 41.) plant quite 
smooth, glaucous ; stems branched, diffuse ; radical leaves spatu- 
late, almost entire, cauline ones sagittate, hardly toothed ; sili- 
ques linear, spreading, twice as long as the pedicels. ©. H. 
Native of North America on the shores of the Arctic Sea. 
Flowers small, and probably white. This may prove to be a spe- 
cies of A’rabis. 
Diffuse Tower-Mustard. Pl. diffuse. 
Cult. As the species of this genus are all weedy-like plants, 
they are only fit for the arrangements in botanical gardens. They 
only require to be sown in the open border ; or on rock-work, in 
any kind of soil. 
X. A’RABIS (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). Lin. gen. no. 818. Lam. ill. t. 563. D.C. syst. 2. 
p- 213. prod..1. p. 142. 
Lin. syst. Tetradyndmia, Siliquosa. Silique linear, with 
flat, 1-nerved valves. Seeds oval, or orbicular, compressed, in 
1 row in each cell. Cotyledons flat. Herbs annual or perennial, 
more or less branched. Radical leaves usually stalked, cauline 
VOL, I.— PART II. 
IX. 
_it by its larger flowers and few-toothed leaves. 
Turritis. X. ARABIS. 161 
ones sessile or clasping the stem, entire or toothed, rarely lobed. 
Hairs variable, but usually those on the stems are simple, and 
those on the leaves are either bifid or trifid. Racemes terminal; 
pedicels bractless. Flowers white, very rarely red. The genus 
is called Wall-Cress in English, because the species usually grow 
in stony places or on walls. 
Secr. I. Axoma‘rium (from a, priv. and wpa, loma, fringe, 
in allusion to the seeds being destitute of a wing round their 
edge, or with a very narrow one). D.C. syst. 2. p. 214. prod. 
1. p.142. Seeds not edged, or girded with a very narrow wing. 
§ 1. Obovatipétala. Cauline leaves cordate, clasping the stem. 
Limb of petals obovate, spreading, distinct from the claw. 
1 A. ve’rna (R. Br. in hort. kew, ed. 2. vol. 4. p. 105.) 
cauline leaves cordate, clasping the stem, toothed, scabrous 
with 3-parted hairs; pedicels shorter than the calyx; stigma 
somewhat emarginate. ©. H. Native throughout the south 
of Europe in corn fields and gravelly places. Heésperis vérna, 
Lin. spec. 928. Smith, fl. græc. 641. A’rabis violàcea, Moench. 
meth. 259. Turrìtis purpùrea, Lam. fl. fr. 2. p. 491.—Mor. 
hist. 2. p. 241. sect. 3. t.8. f. 5. Petals small, purple, with a 
white claw. 
Vernal Wall-Cress. Fl.-May, June. Clt. 1710. Pl. 4 to 2 ft. 
2 A. rosea (D.C. syst. 2. p. 215.) cauline leaves oblong, 
somewhat cordate and somewhat stem-clasping, scabrous with 
branched hairs; pedicels longer than the calyx ; stigma apicu- 
lated. &.H. Native of Calabria about Cozenza. Petals 
rose-purple, oblong, somewhat wedge-shaped, double the length 
of the calyx. Deless. icon. sel. 2. t. 23. 
Rose-coloured-flowered Wall-Cress. Fl. May, July. Pl. 1 ft. 
3 A. visco'sa (D. C. syst. 2. p. 216.) leaves distantly-toothed, 
scabrous with branched hairs; radical leaves stalked, obovate- 
oblong, very blunt, cauline ones ovate-cordate, clasping the stem; 
pedicels equal in length with the calyx, which is hairy. %. H. 
Native of the north of Persia on the Alps. Cardamine viscdsa, 
Gmel. in herb. Pall. A tufted plant, with white flowers. 
Clammy Wall-Cress. Fl. April, May. Pl. 3 foot. 
4 A. ALPINA (Lin. spec, 928.) leaves many-toothed, lanceo- 
late, acute, villous with branched hairs, radical ones somewhat 
stalked, cauline ones cordate, clasping the stem; pedicels longer 
than the calyx, which is smoothish. Y.H. Native of Europe 
on rocks and among stones in calcareous mountains, in sunny 
situations ; Spain, Lapland, Greenland, Switzerland, Pyrenees, 
also Madeira and Labrador, &c. Curt. bot. mag. t. 226. A tufted 
plant, with white flowers. 
Var. B, Clusiana (Schrank, fl. mon. 2. p. 125.) leaves more 
sparingly and more bluntly toothed. Clus. hist. 2. p. 125. f. 2. 
Var. y, nana (Baugm. trans. 2. p. 263.) A dwarfer plant. 
Alpine Wall-Cress. Fl. March, May. Clt.1596. Pl. 2 ft. 
5 A. a'LBIDA (Stev. in cat. hort. gor. 1812. p. 51.) leaves few- 
toothed, hoary, or downy with branched hairs; radical leaves 
obovate-oblong, cauline ones cordately-sagittate, clasping the 
stem; pedicels longer than the calyx. %. H. Native of 
Tauria and Caucasus on rocks. Jacq. fil. ecl. 1. p. 105. t. 71. 
A. Caucásica, Willd. enum. suppl. p. 45. Schrank. hort. mon. 
t.24. A. alpina, Pall. ined. Cheiranthus mollis, Horn. hort. 
hafn. p. 615. Very like 4. alpina, but easily distinguished from 
A tufted plant 
with white flowers. 
White-leaved Wall-Cress. Fl. Jan. May. Clt. 1798. Pl. 3 ft. 
6 A. unpuxa‘ra (Link. enum. hort. berl. 2. p. 161.) stem 
erect, and is hairy as well as the oblong-toothed waved leaves ; 
pods spreading ; style the breadth of the pod. 4. H. Native 
of the south of Europe. Like 4. albida, but the whole plant is 
Y 
