146 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



The anomalies displayed by the Mexican representatives of the 

 section have already been discussed on p. 24. It seems best to widen 

 the definition of Koch to include the sub-shrubs so characteristic 

 of the Mexican Sedum-flora. 



Included in the Seda Genuina are also the yellow-flowered Japonica 

 series of Maximowicz from China and Japan (of which SS. Celiac 

 Hamet, japonicum Siebold, lineare Thunberg, muUicaule Wallich, 

 sarnteniosum Bunge, Chauveaudi Hamet, trullipetalum H. f. and T., 

 variicolor Praeger, Zentaro-Tashiroi Makino, are in cultivation), the 

 ovoid-leaved S. nudum and 5. lanceroiiense from the Atlantic Islands, 

 and the peculiar white-flowered S. Chaneti from China. 



General Arrangement of the Seda Genuina. 



A. Flowers white. 

 [a) Sub-shrubs. 



populifolium, reiusum, Adolphi, frulescens, allantoides, 

 Bourgaei, guadalajaranum, gnseum. 

 [h) Herbs. 



(i) Leaves flat : ternatum, Nevii, adenotrichum, Chaneti, 



alsinefolium, magellense, monregalense, moranense, 



Liebmannianum, compactum. 

 (2) Leaves terete or sub-terete : dasyphyllum, hrevifolium, 



anglicum, album, gypsicolum, hirsulum, Lydium, 



gracile, Alberti. 



B. Flowers red or purple. 

 [a) Sub-shrub. 



oxypeialum. 

 {h) Herbs. 



(i) Leaves flat : spurium, stoloniferum, proponticum, 



Stevenianum, rhodocarpum, longipes. 

 (2) Leaves terete : pulchellum. 



C. Flowers yellow. 

 {a) Sub-shrubs. 



nutans, praealtum, dendroideum, confusum, amecamecanum, 



pachyphyllum, Treleasei. 

 (6) Herbs. 



(i) Leaves opposite or whorled : rubroglaucum, divergens^ 

 Stahlii, Zentaro-Tashiroi, Chauveaudi, sarmeniosum, 

 lineare, mexicanum. 



(2) Leaves alternate. 



(i.) Leaves spathulate, flat : Palmeri, compressum, 

 variicolor, spathulifolium, yosemitense, Hallii, oreganum. 

 (ii.) Leaves not broadest above (ovate to linear) : 

 humifusum, cupressoides, acre, Stribrnyi, oaxacanum, 

 nudum, lanceroiiense, japonicum, alpesire, Douglasii, 

 muUicaule, trullipetalum. Celiac, multiceps, sexangulare, 

 rupesire, reflexum, altissimum, anopctalum, sieno- 

 petalum, pruinatum, amplcxicaule. 



