( 240 .) 
THLVSPI* * * * § . 
Linnean Class and Order. Tetradyna'mia f, Siltculo'sa %. 
Natural Order. Cruci'ferai§, Juss. Gen. PI. p. 237. — Sm, 
Gram, of Bot. p. 138. Engl. FI. v. iii. p. 153. — Rich, by Macgilliv. 
p. 498. — Crucifers ; subord. Pleiirorhize.e|| ; tribe, Thlas- 
pide.e ; Lindl. Syn. pp. 20, 22, & 27. ; Introd. to Nat. Syst. of Bot. 
pp. 14 to 18. — Loud. Hort. Brit. pp. 498 & 499.; Mag. Nat. Hist, 
v. i. pp. 143 & 240. — Don’s Gen. Syst. of Gard. and Bot. v. i. 
pp. 146 & 148. — Mack. FI. Ilib. pt. i. p. 16. — Rosales; subord. 
Rhceadosje ; sect. Rh.eadina! ; type, Brassicace^: ; subtype, 
Arabjd.e ; Burn. Outl. of Bot. pp. 614, 784, 847, 854, & 856. — 
Siliquos/e, Linn. 
Gen. Char. Calyx (see figs. 1 & 2.) inferior, of 4 egg-shaped, 
concave, moderately spreading, deciduous sepals, equal at the base. 
Corolla (see figs. 1 & 2.) cruciform ; of 4 inversely egg-shaped, 
equal, undivided, or sometimes slightly notched, petals ; their claws 
short and broad (fig. 3). Filaments (see fig. 4.) 6, 2 shorter than 
the other 4, simple, slender. Anthers heart-sbaped. Germen (fig. 5.) 
roundish, compressed, notched. Style (see fig. 4.) short. Stigma 
blunt. Pouch or Silicle (fig. 6.) laterally compressed, imarginate 
at the apex ; valves (see fig. 8.) winged at the back ; cells (see 
fig. 7.) 2- or many-seeded. Partition ( Dissepiment ) (fig. 9.) elliptic- 
spear-shaped, crossing the greater diameter of the pouch. Seeds 
(see figs. 9 & 10.) 2 or more in each cell, oval. Cotyledons (fig. 10.) 
flat, accumbent (o=). 
The laterally compressed pouch, emarginate at the apex ; the 
navicular (boat-shaped) valves, winged at the back ; and the 2-, or 
many-seeded cells ; will distinguish this from other genera, witli 
accumbent cotyledons, in the same class and order. — It differs from 
Capsella (t. 191.) in the valves being Avinged at the back; and in 
the cotyledons being accumbent (o=), not incumbent (o||). 
Three species British. 
THLA'SPI PERFOLIA'TUM. Perfoliate Penny-cress. Perfo- 
liate Shepherd’s Purse. Small Thorow-cress. 
Spec. Char. Pouch inversely heart-shaped. Style included 
within the notch. Stem-leaves heart-shaped, rather sharp at the 
base, clasping the branched stem, somewhat toothed, smooth. 
Annual. — Flowers in March and April. 
Engl. Bot. t. 2354. — Hook. FI. Lond. t. 46. — Jacq. FI. Austr. t. 337. — Linn. 
Sp. PI. p.902 -Huds. FI. Angl. (1st ed.) p. 246. — VVilld. Sp. PI. v. iii. pt. i. 
p. 446.— Sm. FI. Brit. v. ii. p.685. Engl. FI. v. iii. p. 172. — With. (7th ed.) 
v. iii. p. 759. — Gray’s Nat. Arr. v. ii. p. 692. — Lindl. Syn. p.27. — Hook. Brit. 
FI. p. 295. — Sibth. FI. Oxon. p. 199.— Purt. Midi. FI. v. iii. p. 56. — Walker’s 
FI. of Oxf. p. 185. — Don’s Gen. Syst. of Gard. & Bot. v. i. p. 191. — Thlaspi 
Figs. 1 & 2. Separate Flowers. — Fig. 3. A Petal. — Fig. 4. Stamens, Germen, 
Style, and Stigma. — Fig. 5. Germen. — Fig. 6. Pouch. — Fig. 7. Transverse section 
of ditto. — Fig. 8. One of the Valves. — Fig. 9. The Partition. — Fig. 10. The ac- 
cumbent Cotyledons.— All, except fig. 1, a little magnified. 
* From thalo, Gr. to flatten ; on account, probably, of its compressed seeds 
or seed-vessels. Hooker. 
t See Draba verna, f. 38, n. f. ; See Crambe maritima, f. 107, n. {. 
§ See folio 38, a. || See folio 141, note ||. 
