32 
VI. CRUCIFERS : TIILASPIDE.E. [ TJlldspi. 
Tribe III. T hlaspidejs. Pouch compressed , with the dissepi- 
ment very narrow in the narrowest diameter , valves heeled or 
winged. Cot. o—. (Gen. 13 — 16.) 
13. Thlaspi Linn. Penny-Cress. 
Pouch laterally compressed, emarginate ; valves winged at the 
back; cells 2 — 8-seeded. — Named from St\ao>, to flatten; on 
account probably of its compressed seed-vessels. 
1. T. arvense L. (Field P. or Mithridate Mustard ); pouch 
orbicular with a broad longitudinal wing, wing with a slender 
marginal nerve, cells about 6-seeded, seeds concentrically striate, 
leaves arrow-shaped toothed glabrous. E. B. t. 1659. 
Fields and road-sides, in various places; but not common. ©. 
5 — 7. — One foot high, branched above. Flowers extremely small, 
white. Pouch very large, with unusually broad wings. 
2. T. perfolidtum L. ( perfoliate P.) ; pouch obcordate 
with a broad wing above, wing with a marginal nerve, cells 
4 — 6-seeded, seeds smooth, style included within the notch, 
cauline leaves cordate somewhat toothed glabrous. E. B. t. 
2354. 
Limestone pastures ; rare. Burford, Oxfordshire ; Bourton, Up- 
per Slaughter, and Naunton-Seven-Springs, near Stow-on-the-Wold, 
Gloucestershire. Stone walls about Kineton, Warwickshire. ©. 
4, 5. — Raceme elongated when in fruit. 
3. T. alpestre L. (alpine P ) ; pouch somewhat obovate re- 
fuse winged above, nerve of the wing obsolete, cells 2 — 4-seeded, 
style as long as the notch or exserted, stamens as long as the 
petals, cauline leaves cordato-sagittate, stem simple. E. B. t. 
81. — a. racemes of fruit elongated, style scarcely longer lhan 
the notch of the olilong-obovate pouch. — 13. racemes of fruit 
oblong, style much longer than the notch of the triangular ob- 
cordate pouch. T. oecitanum Jord. — y. racemes of fruit oval 
or oblong, style much longer than the shallow notch of the 
oboval pouch. T. virens Jord. 
Mountain pastures, rare. — a. Teesdale; Thornhaugli, Northumber- 
land ; Glen Isla; Clova. — 0. Settle, Yorkshire; Llanrwst, Caernar- 
vonshire. y. — Matlock, Derbyshire. 6 — 8. Upon the above 
slender distinctions has this species been split into three, T. oecitanum 
being intermediate between the extreme forms. 
14. Hutchinsia Br. (not of Agardh .) Hutchinsia. 
Pouch elliptical, entire ; the valves keeled, without wings ; 
cells 2-seeded. Filaments simple. — Named in honour of the 
