(210.) 
I'SATIS* *. - 
Linnean Class and Order. Tetradyda'mia f, Silicvlo'sa 
Natural Order. Cruci'fer^, Jus 4 ;. Gen. PI. p. 237. — Sm. 
Gr. of Bot. p. 138. Engl. FI. v. iii, p. 153. — Rich, by Macgilliv. 
p, 498. — Cruci'feR/E; subord. Notorhi'ze.® ; tribe, Isati'de/E; 
Lind I. Syn. pp. 20 & 31. ; Introd. to Nat. Syst. of Bot. pp. 14 to 
18. — Loud. Hort. Brit pp. 498 & 499. ; and Mag. of Nat. Hist.v. i. 
pp. 143 & 240. — Don’s Gen. Syst. of Card, and Bot. v. i. pp. 145, 
149, 150, & 223. — Rosales; subord. Rhceados/e; sect. Rhas- 
adiNjE ; type, Brassicacea? ; subtype, Sisymisrida^ ; district, 
Isatide.e ; Burn. Outl. of Bot. v. ii. pp. 614, 784, 847, 854, 858, 
and 860. — Siliquosa?, Linn. 
Gen. Char. Calyx (figs. 1 & 2.) inferior, coloured ; of 4 egg- 
shaped, concave, spreading, deciduous sepals, equal at the base. 
Corolla (figs. 3 & 4.) cruciform, of 4, inversely egg-shaped, entire, 
equal petals, tapering at the base into short claws. Filaments (see 
fig. 4, c.) 6, thread-shaped, spreading, simple, as long as the sepals, 
4 longer than the other 2 (tetradydamous) . Anthers roundish. 
Germen (fig. 4, d.) roundish, compressed. Style none. Stigma 
capitate, sessile. Pouch ( silicic ) (fig. 7.) oblong, blunt, flat, 1- 
celled, 1-seeded ; valves (fig. 8.) keeled, eventually separating. 
Seed (fig. 9.) solitary, oblong, pendulous at the top of the cell. 
Cotyledons (see fig. 10.) flattish, incumbent (o||). 
The 1-celled, 1-seeded, entire, deciduous, bordered, transversely 
compressed pouch, of 2 valves, will distinguish this from other ge- 
nera, with incumbent cotyledons, in the same class and order. 
One species British. 
I'SATIS TINCTO'RIA. Dyer’s Woad. 
Spec. Char. Pouch wedge-shaped, acuminated at the base, 
somewhat spatulate at the end, very blunt, smooth, thrice as long as 
broad. Radical-leaves crenate ; those of the stem entire, arrow- 
shaped at the base. 
Engl. Bot. t.97. — Mart. FI. Rust. t. 41. — Linn. Spec. PI. p. 936. — Huds. FI. 
Angl. (2nd edit.) p. 299. — Sm. FI. Brit. v. ii. p. 693. Engl. FI. v. iii. p. 182. — 
With. (7lh edit.) v. iii. p. 752. — Gray’s Nat. Arr. v. ii. p. 690. — Lindl. Syn. p. 
32. — Ilook. Brit. FI. p. 294. — Relli. FI. Cant. (3rd ed.) p. 264. — Winch’s FI. of 
Northumb. and Durh. p. 43. — Don’s Gen. Syst. of Card, and Bot. v. i. p. 224. — 
Mack. Cat. of PI. of lrel. p. 61. FI. Hibern. pt. i. p.Tl. — Glastum. sativum, 
Ray’s Syn. p. 307. — Glastum sylvestre, J ohnson’s Gerarde, p. 491. 
Localities. — In cornfields, and about their borders; also about old stone- 
pits; rare. — Cambridgesh. New Barnes near Ely ; Isle of Ely : Rev. R. Rel- 
ii a n . Near Wisbech: Mr. Woodward. — Cheshire; Near Broken Brow, 
Stockport : Mr. G. Holme. — Devon ; Cornfields, and borders of cornfields, rare: 
Fig. 1. Calyx.— Fig. 2. The same.— Fig. 3. A separate flower.— Fig. 4. The 
same ; a. one of the 4 sepals ; b. one of the 4 petals ; c. one of the 6 stamens ; 
d. The germen. — Fig. 5. A separate Petal. — Fig. 6. A youug Pouch. — Fig. 1. 
A full grown ripe one. — Fig. 8. One of the valves, with the seed. — Fig. 9. A 
Seed. — Fig. 10. The Embryo, showing the Radicle and incumbent Cotyledons. 
—Figs. 1,3,6, 7, 8, & 9, of the natural size ; the rest more or less magnified. 
* From isazo, Gr. to render equal ; the plant was believed to destroy, by its 
simple application, all roughness and inequalities of the skin, 
t See folio 38, note f. t See folio 107, note f. $ See folio 38, a. 
