Thlaspi.] CRUciFER^. 41 



reclining, from 2 or 3 inches to a foot in length, acutely angular, deeply grooved, 

 twisted, sometimes bluish purple at base, more or less divaricately branched. 

 Leaves nearly all stalked, very small, thick and succulent, those at the root and 

 lowermost part of the stem simply cordate or roundish, entire or very slightly 

 lobed, obtuse, on very slender petioles; those higher up cordato-ovate, subdeltoid, 

 shallowly and bluntly 3 — 5 lobed and angled, on gradually tapering footstalks ; 

 the highest of all cordato-triangular, acutely 3-lobed and pointed, from very 

 shortly stalked to nearly or quite sessile ; sometimes ovato-oblong and undivided. 

 Racemes simple, terminal, naked, at first corymbose, afterwards elongated as the 

 flowering advances. Pedicels (in fruit) patent or divaricate, about a quarter of an 

 inch in length. Bracts none. Pouches small, greenish, smooth, in short clusters 

 on patent pedicels, ovato-elliptical when viewed from the back of either cell, 

 broader at the base when seen in the axis of the dissepiment, scarcely at all com- 

 pressed, and in my specimens very obscurely veined even when looked at against 

 the light, tipped with the very short style. Seeds 4 — 6 in each cell, reddish 

 brown, roundish or ovate, rough all over with coarse blunt granulations. 



XV. Aemoracia, Fl. Wett. Horse-radish. 



"PoMc/i elliptical or globose, many-seeded; the valves turgid, 

 not nerved. Filaments simple. Hypogynous glands 6. Seeds 

 not margined. Calyx patent." — Br. Fl. 



*1. A. rusticana, Fl. W. Horse-radish. " Eadieal leaves 

 oblong on long footstalks crenate, cauline ones elongato-lanceo- 

 late serrate or entire, root long cylindrical, petals (white) twice as 

 long as the calyx, pouch 2 — 3 times shorter than the pedicel, 

 stigma peltate." — Br. Fl. p. 28. Cochlearia Armoracia, L. : E. 

 B. t. 2323. 



In moist pastures, and (more commonly) in waste ground about towns and vil- 

 lages, especially on a stiff soil, occasionally ; not indigenous. i^Z. May. If. 



E. Med. — On Eyde Dover, abundant ; but seldom seen to flower. In the mea- 

 dow by the stream immediately above Horringford bridge. 



W. Med.— In a meadow at Freshwater, just before coming to Schoolhouse 

 green, sparingly and probably ejected from some cottage-garden. 



Dr. Martin found this plant on the Dover with the leaves variously cut, and 

 even deeply pinnatifld, which is not unusual. 



Division II. Angds.tiseptjb. 



Pouch short, laterally compressed, opening with two boat -shaped valves 

 keeled and winged on the back; dissepiment narrow, linear or elliptical-lan- 

 ceolate. 



Tribe Thlaspideae. Cotyledons 0—. 



XVI. Thlaspi, Linn. Penny- cress. 



" Pouch laterally compressed, emarginate ; valves wingless at 

 the back ; cells 2—8 seeded."— .Br. Fl. 



1. lL.arvense,'L. Penny Cress. Mithridate Mustard. _ "Pouch 

 orbicular entirely surrounded with a broad longitudinal wing, 

 wing with a marginal nerve, cells about 6 -seeded, seeds concen- 

 trically striated, leaves arrow-shaped toothed glabrous."— ^r. Fl. 

 p. 31. E. B. t. 1659. 



