170 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



Kom., has been grown for long as P. cortusoides, Linn., and has come 

 in probably under that name. The P. oreodoxa of gardens is this 

 plant. 



Asiatic Species [neither Himalayan nor Chinese) of the Cortusoides 



Section. 



Rose to lilac-blue coloured flowers. 

 P. cortusoides, Linn. P. saxatilis, Kom. (fig. So) 



P. Kaufmanniana, Regel P. Sieboldii, E. Morren (fig. 81) 



Section Verticillata. 



The development in South-West Arabia and Abyssinia of a type 

 of 3'ellow-flowered Primula which is elsewhere represented by a single 

 species — P. floribunda, Wall. — in Afghanistan and the West Himalayas 

 is a fact of distribution which, at first stating astonishing, ceases to be 

 so when the many floristic relationships of the regions are fully 

 appreciated. I interpolate here — the species P. Lacei, Hemsl. & Watt, 

 brought into this section by Pax, finds its right place in Suffruticosa. 



P. Aucheri, Jaub. et Spach., and P. verticillata, Forsk., are two species 

 which dwell on moist rocks in the area named — the former a rare 

 and little-known species, the latter one of the best-known species in 

 our gardens, into which it was introduced so long since as 1825 through 

 the Botanic Garden at Berlin. Two microforms of P. verticillata, 

 Forsk., are recognized — P. Boveana, Decne, and P. simensis, Hochst., 

 the latter the form which occurs in Abyssinia. The differences between 

 P. verticillata, Forsk., and these microforms are slight and have not 

 always been recognized in gardens. Indeed, the plant introduced 

 as P. verticillata and figured in the " Botanical Magazine " in 1828 is 

 the microform P. Boveana, Decne. 



As a greenhouse plant P. verticillata, Forsk., and its microforms have 

 paramount claims which, however, are endangered by that wonder- 

 ful hybrid P. x kewensis, Watson, a spontaneous cross between 

 P. verticillata, Forsk., and the Indian P. floribunda, Wall., a plant in 

 which students of genetics are finding what promises to be of scientific 

 and horticultural importance. 



Asiatic Species (neither Himalayan nor Chinese) of the Verticillata 



Section. 

 Yellow flowers. 

 P. Aucheri, Jaub. et Spach. P. Boveana, Decne. 

 P. verticillata, Forsk. 



Section Vernalis. 



The Asiatic development of this section, which includes our common 

 European primrose, cowslip, and oxlip, is remarkable in this, that it 

 gives us colour forms other than yellow. To these Asiatic forms 

 our gardens owe much. I need not specify here the characters of 

 this well-known section. 



