THALAMIFLOn.E 



i6. Barbarea (Winter Cress).— Poi linear, 4-angled ; valves 

 with prominent nerve ; seeds in a single row ; calyx erect. (Name 

 from St. Barbara, to whom it was anciently dedicated.) 



17. Nasturtium (Cress).— Poi nearly cylindrical, short ; valves 

 convex, nerveless ; seeds irregularly placed in two rows ; calyx 

 spreading. (Name from nasiis tortus, a distorted nose, on account 

 of the pungent properties of the plant.) 



18. Sisymbrium (Hedge Mustard).— Pof? rounded or angular ; 

 valves convex, with 3 (or rarely i) nerves ; stigma entire ; seeds in 

 a single row ; seed-stalks .slender. (Name, the Greek name of the 

 plant.) 



19. Ai.liaria (Garlic IMustard). — Pod long, linear, rounded ; 

 valves .slightly 3-nerved ; seeds striated ; seed-stalks flat. (Name 

 from the Latm, allium, garlic.) 



20. ErysiiMUJI (Treacle Mustard). — Pod 4-sided ; valves keeled ; 

 stigma obtuse, entire or notched ; seeds iii a single row, smooth, 

 not margined. (Name from the Greek, eriio, to cure, on account 

 of the supposed virtues of the plant.) 



21. Cheiranthus (Wall-flower). — Pod flattened; valves with a 

 prominent nerve ; stigma of two spreading lobes. (Name of 

 Arabic origin.) 



22. Matthiola (Stock). — Pod nearly cylindrical, or flattened ; 

 stigma of two erect parallel lobes ; seeds generally with a mem 



branous border, 

 botanist.) 



(Named in honour of Dr. Matthiohis, an Italian 



23. Brassica (Cabbage). — Pod nearly cylin- 

 drical, beaked ; seeds gloliose. (Name from the 

 Celtic, hresic a cabbage.) 



Pod wit/ioiit valves 



24, Raph.anus (Radish), 

 b perfectly jointed, taperi 



spreading. (Name in Gi(,;;ek, 

 pearance or quick growth.) 



— Pods swollen, im- 



secds globular ; calvx 



denoting early ap- 



Thi.aspi Arvense 

 {Penny Cress) 



1. Thlaspi {Penny Cress) 



I. T. arvense (Mithridate Mustard, or Penny 

 Cress). — Pouch round, flat, with very broad wings 

 and a deep notch ; leaves oblong, arrow-shaped 

 at the base, toothed, smooth. Height about a 

 foot. In cultivated or waste ground, but not 

 common. Penny Cress derives its name from the 

 resemblance which its seed-vessels in size and 

 shape bear to silver pennies ; its longer name is 



