22 



SUBULAKIA 



Aquatica {Water 

 A wl-wort) 



THALAMIFLOR^ 



from the use of fresh vegetables. Many other 

 plants of the same tribe possess antiscorbutic pro- 

 perties to an equal degree, but these are particu- 

 larly available from always growmg near the sea. 

 The use of lime-juice in the navy and merchant 

 service has rendered the attacks of this disease less 

 frequent than they used to lie. 



8. SuBULARiA {Awl-wort) 



aqitatica (Water Awl-wort). — The only 



The roots are composed of long white 



the leaves all grow from the roofs, and 



are awl-shaped ; the flowers are small and few ; 



petals white. The plant often grows entirely 



mider water ; common on the banks of Alpine 



lakes. — Fl. July. Annual. 



I. S. 



species, 

 fibres ; 



g. Alyssum {Alyssiim) 



1. A. calyciniiin (Small Alyssum). — A small annual, 3-6 inches 

 high. Flowers pale yellow ; sepals persistent, or remaining on the 

 pods. Waste places, rare. — Fl. A])ril to June. 



2. A. maritinwm (Sweet Alyssum). — A pretty garden plant, with 

 trailing ascending stems and white, sweet-scented flowers; sepals 

 falling off. In many places it has become established as a garden 

 escape. — Fl. all summer. Annual or perennial. 



10. Draba {Whitlow Grass) 



1. D. aizoides (Yellow Alpine Whitlow Grass). — Flower-stalk 

 leafless, smooth ; petals notched, twice as long as the calyx ; style 

 much longer than the stamens ; leaves narrow, pointed, rigid, 

 glossy, keeled, and fringed. On rocks and walls at Pannard Castle, 

 near Swansea, where it forms dense tufts, conspicuous with bright 

 yellow flowers. — Fl. March, April. Perennial. 



2. D. rtipestris (Rock Whitlow Grass).. — A very rare species 

 growing in the crevices of the rocks and among moss, on the summits 

 of some of the Highland mountains. It seldom ex'ceeds 2 inches 

 in height ; the flower-stems are usually leafless, several growing 

 from the same root ; the leaves grow in tufts and are slightly 

 hairy. — Fl. July. Perennial. 



3. D. incana (Twisted Whitlow Grass). — Stems 4-12 inches high, 

 bearing small white flowers ; stem-leaves narrow, toothed, hoary ; 

 petals entire ; pouch twisted. Remarkable for the down on its 

 leaves, which is forked in a starlike manner. Mountains and 

 sand dunes on the coast, scarce. — Fl. June, July. Biennial. 



