(423.) 
TEESDA'Lf A * *. 
Linnean Class and Order. TETRADYNA'MiAf, Siliculo'sa £. 
Natural Order. Cuuci'fera? §, Juss. Gen. PI. p. 237. — Sm. 
Gram, of Bot. p. 1 38. ; Engl. FI. v. iii. p. 1 53. — Rich, by Macgilliv. 
p.498. — Crucifer.®:; subord. Pleurorhize.e|| ; tribe, Thi.as- 
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. Hibern. pt. i. p. 16. — Hook. Brit. FI. 
(4th edit.) p. 397. — Rosales ; subord. Rhceados.® ; sect. Rhjea- 
din.e ; type, BRASSiCACEiE ; subtype, Arabid.e; Burn. Outl. of 
Bot. pp. 614, 784, 847, 854, & 856. — Siliquos.e, Linn. 
Gen. Char. Calyx (fig. 1.) inferior, equal at the base, of 
4 spreading, egg-shaped, concave, nearly equal, deciduous sepals. 
Corolla (see fig. 2.) of 4 inversely egg-shaped, entire, spreading, 
equal, or unequal, petals, the 2 outermost in the latter case much 
the largest. Filaments (see figs. 2, 4, & 5.) 6, sometimes but 4, 
cylindrical, shorter than the corolla, incurved, each having a little 
petal-like scale within at the base (see fig. 5). Anthers of 2 round, 
distinct, converging lobes. Germen (see fig. 4.) roundish, 2-lobed, 
rather compressed. Stigma globular, sessile. Pouch (siliculaj 
(see fig. 6.) transversely compressed, roundish, concave on one side ; 
bordered at the summit and notched ; of 2 cells, and 2 boat-like 
valves, with dilated keels; partition [dissepiment] (fig. 7.) spear- 
shaped, narrow, contrary to the greater diameter of the pouch. 
Seeds (fig. 8.) 2 in each cell, roundish, compressed ; cotyledons 
nearly orbicular, accumbent (o=). 
The emarginate pouch, with keeled valves, and 2-seeded cells ; 
and the filaments each with a little scale within at the base ; will 
distinguish this from other genera, with accumbent cotyledons, in 
the same class and order. 
One species British. 
TEESDA'LIA NUDICAULIS. Naked-stalkedTeesdalia. Heath- 
cress. Shepherd’s Cress. Small Shepherd’s Purse. 
Spec. Char. Petals unequal, outer ones largest. 
Brown in Ait. Hort. Kew. (2nd ed.) v. iv. p. 83. — Sm. in Tr. of Linn. Soc. v. xi. 
p. 286.; Engl. FI. v. iii. p. 170. — With. (7th ed.) v. iii. p. 765. — Hook. Brit. FI. 
p. 296. ; FI. Scot. p. 194. — FI. Devon, pp. 108 & 188. — Johnst. FI. of Berw. v. i. 
p. 141. — Winch’s FI. of Northumb. & Durli. p. 43. — W'alker’s FI. of Oxf. p. 184. — 
Perry’s PI. Yarvic. Sel. p 53. — Pampl. PI. of Battersea, p. 11. — Dick. FI. Abred. 
p. 45. — Bab. Prim. FI. Sam. p. 6. — lrv. Loud. FI. p. 162. — Luxf. lleig. FI. p. 57. — 
Fig. 1. Calyx. — Figs. 2 & 3. Separate Flowers. — Fig. 4 Stamens, Pistil, and 
petal-like Scales. — Fig. 5. A separate Stamen, with its accompanying Scale — 
Fig. 6. A Pouch, with its fruit-stalk. — Fig. 7. Partition. — Fig. 8. Seed. — Fig. 9. 
The accumbent Cotyledons. — All , except figs. 6 & 8, more or less magnified . 
* So named by Dr. Robert Brown, in honour of the late Mr. Robert Tbbs- 
dale, F. L. S., formerly gardener to the Earl of Carlisle, at Castle Howard, York- 
shire, an excellent British Botanist, who died at Turnham Green, near London, 
December 25, 1804. 
t See f. 38, n. t. f See f. 107, n. 4. ? See f. 38, a. || See f. 141, n.|l. 
