CENTRAL EXPERIMENTAL FARM 



POTENTILLA Con. 



P. rupestris, L. Europe, &c. 



PL, 1895. Hardy. Ht. 1$ ft. Fl. 

 white; May 26 to July 11. 



P. tridentata, SOLAND. North Amer. 

 PL, 1895. Hardy. Ht. 4 to 6 in. 

 FL white; June. 



POTERIUM, L. BURNET. 

 (Eosacece.) 



P. canadense, A. GRAY. Canadian Bur- 

 net. North America. 

 Syn. Sanguisorba canadensis, Rupp. 

 PL, 1908. 



PRIMULA, L. PRIMROSE. 



(PrimulaceoB.) 



P. Auricula, L. Bear's Ears. Europe. 

 PL, 1908. Tender. 



**P. cortusoides, L. Japan, Siberia, &c. 

 PL, 1905. Half hardy. Ht. 6 to 12 

 in. FL rose; May. 



P. denticulata, SM. Himalayas. 

 PL, 1905. Tender. 



***P. elatior Harry Mitchell. 



PL, 1905. Half hardy. Ht. 6 in. 

 FL pale yellow; May. 



P. officinalis microcalyx. 

 PL, 1907. 



***P. Sieboldii, MORR. Japan. 



PL, 1905. Hardy. Ht. 6 to 9 in 

 FL varies in colour from deep 

 rose to white; late May to June. 



PRUNELLA, L. SELF HEAL. 



(Labiatce.) 

 P. alba, Pall. = P. laciniata. 



P. laciniata, L. Europe ; North Africa 

 Syn. P. alba, Pall. 

 PL, 1902. Half hardy. Ht, 1* ft 

 FL white; July 10 to Aug. 21. 



P. vulgaris, L. Common Self Heal 



Temperate regions. 

 PL, 1901. Hardy. Ht. 6 to 12 in 

 FL violet. June to Sept. 



PUSCHKINIA, ADAMS. 



(LiliacecB.) 

 P. libanotica, Zucc. = P. scilloides. 



***P. scilloides, ADAMS. Striped Squill. 



Asia Minor, &c. 

 Syn. P. libanotica. 



PL, 1901. Hardy. Ht. 6 in. Fl. 

 white striped with pale blue ; 

 April to May. 



PULMONARIA,-. LUNGWORT. 



(Boraginacece.) 



P. angustifolia, L. Europe. 



PL, 1903. Hardy. Ht. 1 ft. Fl. 

 pink changing to deep purplish 

 blue; May 20 to June 20. 



P. arvernense, HORT. Origin uncertain. 



PL, 1903. Hardy. Ht. 1 to 1 ft. 



FL deep blue ; May 25 to June 12. 



P. maculata, F. G. Dietr. = P. offlci- 



P. mollis, Wolff. = P. montana. 



*P. montana, LEJ. Central Europe. 



Syn. P. mollis, Wolff. 



PL, 1905. Hardy. Ht. 1 ft. FL 

 deep purplish blue, somewhat 

 rosy in bud. May 19 to June 16 



*P. officinalis, L. Common Lungwort. 



Europe. 



Syn. P. maculata, F. G. Dietr. 

 PL, 1895. Hardy. Ht. 6 to 12 in. 



Fl. red, then violet; May. 



P. officinalis alba, 



PL, 1905. Hardy. Ht. 1 ft. Fl. 

 white. 



*P. saccharata, MILL. Bethlehem Sage. 



Europe. 



PL, 1895. Hardy. Ht. 1 ft. Fl. 

 purplish blue and pink; May 1C 

 to June 21. 



P. sibirica, L. = Mertensia sibirica, G. 

 Don. 



RAMONDIA, RICH. 



(Gesneriacece.) 



R, pyrenaica, EICH. Eosette Mullein- 

 Pyrenees. 

 PL, 1905. Tender. 



