48 



CRUCIFER/E 



with a Hat, two edged, sword-like beak. — Waste ground. --F1. June, 

 July. Annual. Seedling.s of this species are largely eaten, with 

 those of Cress {Lepidium sativum), as salad. 



14. DiPLOT.ixis (Rocket) has spreading sepals : but differs from 

 the mustards in its llatlened puds wUh uiembranoua valves and 

 seeds m two rows. (Name from the Greek diplos, double, taxis, 

 rank or row ) 



1. D. teiiiiifblia (Wall Rocket). — Slender, branched, i — 2 feet 

 high ; ste)n woody below ; leaves deeply divided into long narrow 

 segments, glaucous ; floiuei-s 4 in. acijoss, light yellow, fragrant ; 

 pods short, linear, erect, on very long slender stalks. — On old 

 walls. — Fl. June — September. Perennial. 



2. D. murdlis (Sand Rocket), a less branched, hispid, herba- 

 ceous, and generally annual species, grows in waste ground, 

 especially near the sea. 



*i5. Alyssum, a genus of small (plants, mostly hoary with 

 adpressed hairs, with simple leaves, small white or yA\o\w jlojccrs, 

 and rounded, few-seeded pods, inckides three alien species, 

 sometimes naturalised : A. incdnuin, A. alysso'uies, with stellate 

 hairs: yellow //('a'vv.v, and persistent sepals : and .i. /iiarili?niiiii, 

 with bi-partite //i?/>5 ,■ white, sweet-scented _,^(5ri:'tv,f, and deciduous 

 sepals. 



16. Draba ( Whitlow-grass). ^Small herbs, mostly perennial 

 and hoary with stellate hairs ; leaves' small, simple, the radical 

 ones in a rosette ; flowers small, white or yellow ; pods compressed 

 or turgid. (Name from the Greek drqbe, acrid.) 



"'" J'lowe/s udilte 



1. £>. murdlis (Speedwell-leaved Whitlow-grass). — Ste/ii leafy, 

 branched, about a foot high ; leaves rough, with stellate hairs, 

 egg-shaped, blunt, toothed, embracing t^e stem ; pedicels spreading 

 horizontally, — Limestone hills in the west of England ; rare. — 

 Fl. April, May. Annual. 



2. D. incdna (Twisted Whitlow-grass).— ^SVtV// leafy, branched, 

 4 — 14 in. high; leaves hoary with stellate down, lanceolate, 

 XooshcA; pods twisted. — Mountains, and sandhills ne.ir the sea; 

 uncommon. — F'l. June, July. Perennial. 



;v I), ri/pestris (Rock Whitlow-grass). — .S7d'OT..r several, i — 2 in. 

 high, almost leafless; leaves rosulate, stellately pubescent, ciliate. 

 — In crevices of the rocks and among moss on the summits 

 of some Highland mountains; very rare. — Fl. Jul)', iVugust. 

 Perennial. 



