CL. XV.] TETRADYNAMIA. 263 



5. 0. rubra. Red Broom-rape. Stem simple ; corolla somewhat tumid ; 

 upper lip cleft, lower in three nearly equal, obtuse lobes ; stamens 



fringed ; style partially hairy. Stem about eight inches high, simple, 



swelled at the lower part, purplish-red, tinged with yellow : scales dark- 

 brown : calyx-leaves lance-shaped : spike of rather close flowers, dusky- 

 red. The whole plant, excepting the scales, is covered with very short 

 glandular hairs. Annual: flowers in July: grows in gravelly soil, in 

 rocky places, in Scotland and Ireland ; near Seafield Tower, on the coast 

 of Fife, on disintegrated trap ; island of Staffa, on basaltic rocks ; island 

 of Harris, at Craig-camna, on Gneiss. Eng. Bot. vol. xxv. pi. 1786. 

 Eng. Fl. vol. iii. p. 148. 926. 



6. 0. coirulea. Purple Broom-rape. Stem simple ; bracteas three ; 

 upper lip of the corolla cleft and notched, lower in three equal lance- 

 shaped segments ; style downy. Stem a foot high, dark-grey, an- 

 gular : scales brown : calyx-leaves united, cleft : corolla funnel-shaped, 

 greyish -purple : filaments smooth. The whole plant minutely downy. 

 Perennial : flowers in July : grows in grassy pastures near the sea, the 

 root parasitical on other plants: rare. Eng. Bot. vol. vi. pi. 423. Eng. 

 Fl. vol. iii. p. 149. 927. 



7. 0. ramosa. Branched Broom-rape. Stem branched ; bracteas three ; 

 upper lip of the corolla deeply cleft, lower with three equal lobes, all the 

 segments rounded ; style smoothish. Flowers light-purple, in a loose 

 spike. Annual : flowers in August and September : grows in moist fields, 

 parasitical on the roots of hemp : rare. Eng. Bot. vol. iii. pi. 184. Eng. 

 Fl. vol. iii. p. 150. 928. 



CLASS XV. TETRADYNAMIA. 



Plants bearing Flowers with Six Stamens, of winch four are 

 longer than the other two. 



(Thejloicers have invariably four petals.) 



Order I. SILICULOSA. Seeds inclosed in a short 

 pod or pouch. 



* Pouch entire at the top. 



2. DRA'BA. Pouch entire, oval ; valves nearly flat. Seeds nu- 



merous. 



5. HUTCHl'NSIA. Pouch entire; valves keeled, not bordered. 

 Seeds at least two in each cell. 



3. ALY'SSUM. Pouch entire, bordered, laterally compressed, with 



concave valves. Seeds one or two in each cell. 



10. COCHLEA'RIA. Pouch nearly entire, turgid, wrinkled, two- 



valved. Seeds numerous. 



1. SUBULA'RIA. Pouch entire, transversely compressed, with tumid 

 valves. Seeds numerous. 



4. CAMELl'NA. Pouch entire, with tumid valves. Seeds numerous. 



11. SENEBIE'RA. Pouch nearly entire, transversely compressed, 



wrinkled, two-celled, two-valved. One seed in each cell. 



