13. ELATINAC.EJS. 49 



2. P. serpylldcea (Weihe) : lower I. mostly opposite and 

 crowded, st. long prostrate wiry much branched, racemes 

 ultimately lateral, cal.-wings as in Sp. 1, bract shorter than the 

 pedicel. Si/. E. B. 187. P. depressa (Wend.). Upper part of 

 st. and ped. sep. pet. and caps, sometimes pubescent (P. ciliata 

 Lebel,). Dry pastures. P. VI.-IX. E. S. I. 



3. P. calcdrea (F. Sch.) ; /. chiefly in an irregular terminal 

 rosette large obovate blunt, those of fl.-st. short smaller lanceo- 

 late, cal. -wings oblong their veins branched the lateral looping 

 with a branch from near the middle of the central vein, caps. 

 oblong-obcordate, bract shorter than the pedicel. P. amara 

 Don, E. B. S. 2764. P. amarella Coss. et Germ. Atl. t. 7. 

 St. weak, procumbent or ascending, nearly naked below. Fl.-st. 

 several from the axils of the term, rosette, simple, short; racemes 

 terminal. FJ. blue. Lobes of aril unequal, lateral 4 as long as 

 seed. Chalk hills, rare. P. V. E. 



4. P. amdra (L.) ; lower L larger obovate blunt in a basal 

 rosette, upper 1. oblong-lanceolate, cal.-wings oblong or obovate 

 bhmt their veins simple or slightly branched free, caps, obcordate 

 broader than the wings, lateral bracts shorter than the pedicels. 

 Rosette at crown of rootstock, its 1. much the largest 

 broad rounded at the end. Fl.-st. from the axils of the rosette, 

 simple, short ; upper 1. acute ; racemes terminal. Cal.-wings 

 longer than caps. Lobes of aril nearly equal, blunt, ^ as long 

 as seed. a. P. austriaca (Cr.) ; caps, rounded at the base, fl. 

 very small, pinkish ? or pure white. Sy. E. It. 189. 

 /3. P. uliginosa (R.) ; caps, rather wedgeshaped below, fl. larger, 

 blue. a. Wye Downs [and near SevenoaksJ, Kent. Caterham, 

 Surrey, Mr. W. WUtwell. ft. Cronkley Fell, Yorkshire, 

 Mr. James Backhouse. P. VI. VII. E. 



Order XIII. ELATINACE^E. 



Sep. 3 5, distinct, or slightly connate. Pet. 3 5. Stam. 

 as many or twice as many as the pet., free. Caps. 3 5-celled, 

 3 o-valved, loculicidal, dissepiments adhering to central axis. 

 Styles 35 ; stigmas capitate. Seeds many, albumen 0, embryo 

 curved with the seed. L. opposite. Stip. minute or inconspi- 



1. ELATINE. Cal. 3 4-parted, Pet. 34. Stam. 34 or 

 6 8. Styles 3 4. Caps. 3 4-celled, many-seeded. Seeds 

 cylindrical, straight or bent. 



