Planche 12. 



Saxifragres. 



Fi^. 1. Saxifrage mousse. Les feuilles 

 sont disposees en rosettes, comme chez les 

 nioiisses. A l'aisselle dt's feuilles iiaisent des 

 boui'geons qui sont aussi longs qiieles feuilles 

 qui les protegent (voir plauclie 13, flg. 4). 



Dans les fentes des rocliers des cimes 

 et aretes, de 2300 et 4000 m. 



Fig. 2. Saxifrage bleuätre. Rosettes com- 

 pos(^es de feuilles epaisses, recourbees en 

 dessous et pourvues k leur extremlte d'un 

 point blanchätre (glande calciföre). 



Rochers calcaires, de 1500 a 2800 m. 



Fig. 3. Saxifrage etoilöe. Feuilles radi- 

 cales epaisses, luisantes, dentees vers leur 

 extrenüte, pas de feuilles caulinaires. Fe- 

 tales blancs tachetes de jaune-orange. 



Bords des ruisseaux, rochers humides, 

 de 1200 k 3000 m. 



Fig. 4. Saxifrage Aizoon. ILes feuilles 

 des rosettes sont dentees et bord^es de points 

 blancs (glandes calciferes). 



Murs, rochers, de la plaine jusqu'k 

 3000 m. 



Fig. 5. Saxifrage toujours verte. Feuilles 

 liaeaires, epaisses. Cette plante ressemble 

 beaucoup ä l'orpin äcre ä fleurs jaunes 

 (Sedum acre), mais eUe en ditfere par ses 

 deux pistils. L'orpin en a 5. 



Lieux humides, le long des torrents, 

 rochers humides, de la plaine jusqu'k 3000 m. 



Plate 12. 



Saxifraga. 



Species of Saxifrag-e. 

 Family of the Saxifragaceae. 



Fig. 1. Mosslike Saxifrage. Forming 

 thickly crowded mosslike rosettes; in the 

 axles of the leaves budshaped tufts of leaves 

 are plaeed, whieh are as long as the leaf 

 that protects them (ditference from the nearly 

 allied stitfhaii-ed Saxifrage, plate 13, flg. 4). 



In fissures of rocks, on the aretes and 

 higher summits, from about 2300—4000 m. 



Fig. 2. Bluish Saxifrage. Rosettes com- 

 posed of thick blunt bluish 3-edged leaves 

 which are arehed downwards (in the Illu- 

 stration this is not well reproduced). These 

 bear at their tips a small sunken dot which 

 secretes chalk. 



On chalky rocks, from 1500—2800 m. 



Fig. 3. Stellated Saxifrage. Leaves thick 

 and somewhat glossy, notched towards their 

 ends ; stalk leafless ; petals white with two 

 spots of an orange yellow. 



On the banks of streams and on wet 

 rocks, from about 1200-3000 m. 



Fig. 4. White mounlain Saxifrage. The 

 leaves of the rosettes are shai'ply serrated 

 and bear on their margins white chalk- 

 scales. According to Kerner these scales 

 aet as covering valves for those parts of 

 the epidermis lying immediately under them, 

 which are the only parts of the leaf which 

 let water through. When made wet with 

 rain or dew, the water is sucked up capil- 

 larily between the scales and is absorbed by 

 the leaves. In dry weather the chalkscales 

 are pressed tightly down over the attenuated 

 parts of the membrane and thus prevent a 

 transpiration of the absorbed water. 



On walls and rocks, from the plains to 

 3000 m. 



Fig. 5. Yellow mountain Saxifrage. Lea- 

 ves rather thick, narrow, fleshy; differing 

 from the similar yellow Stone-crop (Sedum 

 acre) by its two styles (Sedum possesses 5). 



Banks of streams, wet stony slopes, 

 wet rocks, from the plains up to 3000 m. 



