PROF. PAX'S ARRANGEMENT OF THE GENUS PRIMULA. 210, 



NOTE ON PROFESSOR PAX'S ARRANGEMENT OF THE 

 GENUS PRIMULA. 



By the Editor. 



In the papers read at the Primula Conference, frequent reference is 

 made to the sections of the genus made by Professor Pax in his recent 

 monograph,* and in several cases modifications of his arrangement 

 are suggested. We have therefore drawn up a brief outline of Pax's 

 classification, and give the names of one or two typical species opposite 

 each of the twenty-one sections into which he divided the genus. 



In almost all Primulas the young leaves have their margins rolled 

 backward when they first emerge from the bud, but in two sections. 

 (4) Floribundae and (21) Auricula, the margins of the young leaves 

 are rolled inwards. These two sections are thus readily distinguished 

 from all the others, and the point is not mentioned again below. 



Section 1. Sinenses, Pax (26 species f). Leaves distinctly petiolate, 

 lobed, dentate or crenate. 



e.g. Primula sinensis, P. obconica, P. cortusoides, P. mollis. 

 Section 2. Fallaces, Pax (4 species). Leaves petiolate, cordate, 

 thin, rugose, hairy ; inflorescence 2-6-flowered, bracteate. 



e.g. P. jesoana, P. Reinii. 

 Section 3. Monocarpicae, Franch. (4 species). Leaves slightly lobed ; 

 calyx enlarging after flowering. 



e.g. P. malacoides, P. Forbesii. 

 Section 4. Floribundae, Pax (6 species). Leaves thin ; flowers in 

 superposed whorls with involucres of leafy bracts. 



e.g. P. floribunda, P. verlicillata. 

 Section 5. Petiolares, Pax (7 species). Leaves almost or quite 

 glabrous, narrowed to their insertion, dentate, with a wide midrib ; 

 flowers large, stalked, arranged in an umbel, on a long or very 

 short scape (comparable in this with the common primrose) ; 

 capsule globose. 



e.g. P. peliolaris, [P. Winlert]. 

 Section 6. Bullatae, Pax (5 species). Leaves coriaceous, hairy, 

 short ; flowers stalked. 



e.g. P. bullata. 



Section 7. Carolinella, (Hemsl.) Pax (4 species). Like section 6, 

 but with large leaves. 



e.g. P. megaseae folia, P. Henryi. 

 Section 8. Vernales, Pax (8 species). Leaves membranous, rugose, 

 usually narrowed to the base, rarely cordate ; flowers stalked. 



e.g. P. acaulis, P. elatior, P. Jiiliae- 



* Pax, F., and Knuth, R., in Engler's Das Pflanzenreich, Heft 22, 

 Pvimulaceae (1905). 



f In Pax's arrangement: 



