266 TETRADTNAMIA SILICULOSA. [jCL. XV. 



April and May : grows on walls in England and Ireland : not common. 

 Eng. Bot. vol.'xiii. pl.912. Eng. Fl. vol. iii. p. 161. 934. 



3. ALYS'SUM. ALYSSUM. 



Calyx of four egg-shaped equal leaves. Petals egg-shaped, flat, 

 spreading, with short claws. Filaments about the length of the 

 calyx; anthers two-lobed. Germen round or elliptical, com- 

 pressed. Style short ; stigma small, simple. Pouch round, oval, 

 or inversely egg-shaped, compressed, two-celled ; valves flattish ; 

 partition membranous. Seeds one or two in each cell, oval, com- 

 pressed. Named from a, privative, and tysson, rage. 316. 



1. A. maritimum. Sweet Alyssum. Stem somewhat woody, much 

 branched ; leaves lance-shaped, acute, entire, hoary with close hairs ; 



seeds solitary. Flowers abundant, in dense corymbose clusters : petals 



white. Perennial : flowers in August and September : grows on banks 

 and rocks near the sea : rare, but is not indigenous. Found in the south 

 of England, and near Aberdeen. Eng. Bot. vol. xxv. pi. 1729. Eng. 

 Fl. vol. iii. p. 163. 935. 



4. CAMELI'NA. CAMELINA. 



Calyx of four oblong, equal, spreading, deciduous leaves. Petals 

 oblong, undivided, with shortish claws. Filaments thread-shaped; 

 anthers heart-shaped. Germen roundish. Style cylindrical, erect; 

 stigma obtuse. Pouch inversely egg-shaped, two-celled, the 

 valves concave, the partition membranous. Seeds numerous in 

 each cell, oblong, compressed. Name, chamaelinum, dwarf- 

 flax. 317. 



1. C. sativa. Gold of Pleasure. Pouches inversely heart-shaped, bor- 

 dered twice the length of the style : leaves lance-shaped, arrow-shaped 

 at the base. Stem erect, about two feet high : flowers small, pale- 

 yellow. Annual : flowers in June : grows in cultivated ground, chiefly 

 among flax, with which it has been imported : rare. Eng. Bot. vol. xviii. 

 pi. 1254 : Alyssum sativum. Eng. Fi. vol. iii. p. 164. 936. 



5. HUTCHI'NSIA. HUTCHINSIA. 



Calyx of four elliptical, equal, spreading, deciduous leaves. 

 Petals inversely egg-shaped, entire. Filaments awl-shaped; an- 

 thers roundish. Germen oval, compressed. Style compressed ; 

 stigma obtuse. Pouch elliptical, compressed, nearly entire, two- 

 celled ; valves keel-shaped ; partition narrow, crossing the greater 

 diameter of the pouch. Seeds two or more in each cell, egg- 

 shaped. Named after Mm Hutchins, an Irish botanist. 318. 



1. H. petrie'a. Rock Hutchinsia. Leaves pinnate, entire ; petals 

 scarcely as long as the calyx ; stigma sessile ; seeds two in each cell. 



Stems two or three inches high, erect, branched : flowers minute, 



white, corymbose. Annual : flowers in March and April : grows on rocks 

 and walls in the west of England, and in Wales : frequent. Eng. Bot. 

 vol. ii. pi. 211 : Lepidium petrtfum. Eng. Fl. vol. iii. p. 168. 937. 



