VEGETABLE IRRITANTS. 57 



ERYSIMUM CHEIRANTHOIDES (British). 



TREACLE WORM SEED. — TREACLE MUSTARD. 



FumariacecB. — Leaves lanceolate. — Waste places and fields. 

 -i-2ft. Bienn. — May-Nov. Yellow. 

 Toxic principle.— 'SMVLK^m^. 



CYNOGLOSSUM OFFICINALE {British). 



HOUND'S TONGUE. — COMMON DOG'S TONGUE. — GIPSY ELOWER. 



BoraginacecB. — Leaves lanceolate, broad, downy, sessile. — 

 Waste ground. Common. 2ft. Bienn. July. Magenta. 

 Toxic principle.— OIL OF HOUND'S TONGUE. 



VERBENA CHAM^DRIFOLIA. 

 VERBENA VENOSA {Cultivated in Britain). 



HARDY GARDEN VERBENA. — L.VRGE-VEINED VERVIAN. 



Verbe7iacecB. — Half-hardy under-shrub. — Stems filiform, fork- 

 branched, creeping. — Flowers scarlet, large spike, solitary on an 

 elongated ascending peduncle. — Leaves oblong or ovate, broadly 

 cuneate at base, crenate or somewhat incise-serrate ; strigose 

 above, hairy beneath, on short petioles. 



VERBENA OFFICINALIS {Cultivated in Britain). 



COMMON VERVL\N. — HOLY HERB. — JUNO'S TEARS. — PIGEON'S 

 GRASS.— SIMPLER'S JOY. 



Verbenacece. — Stems filiform, creeping. — Flowers sparsely 

 scattered on ascending spikes. Pink. — Leaves on short petioles. 

 — June-July. 



ARCTOSTAPHYLOS UVA-URSI {British). 



BURRIN MYRTLE. — CREA'S BAK. — KINNIKKINNIK. — BRAWLINS. 



— MOUNTAIN BOX. — UPLAND CRANBERRY. — RED BEAR BERRY. 



RED BEAR BILBERRY. — RED BEAR'S GRAPE. 



EricacecB. — Evergreen. Stems pi'ocumbent. — Leaves obovate, 

 entire, revolute at the margin. — Stony heaths. 4-6in. Perenn. 

 — May. Pink. — Berries red. (No sepals on the top : as in the 

 Cranberry). 



Toxic principle. — ARBUTIN, also contained in Arbutus unedo, 

 Pyrola umbellata. 



