ROSACEAE. 



121 



PURSHIA. 



(Family Rosaceae). 



Spreading rather rigidly 

 branched shrubs. Twigs some- 

 what fluted, becoming terete, 

 slender, with quickly flaking cor- 

 tex: pith minute, angular, con- 

 tinuous, light brown. Buds soli- 

 tary, sessile, ovoid, with several 

 more or less ciliate scales, rather 

 quickly developing into short 

 branches covered by the over- 

 lapping leaf-bases. Leaf-scars al- 

 ternate, half-round, with 1 bundle- 

 trace, minute, much raised on 

 thin winged bases topped by the 

 stipules, or these finally falling 

 and their linear scars encircling 

 the stem. (Tigarea; Kunzia). 



Purshia is hardly to be counted 



a decorative plant. 



Twigs at first somewhat hairy 



and bristly. P. tridentata. 



Winter-character references to Crataegus: C. azarolus. 



Bosemann, 50; Schneider, f. 172. G. coccinea. Hitchcock (1), 



4, (3), 15, (4), 137, f. 71-73. G. crus-galli. Bosemann, 50; 



Schneider, f. 173. G. monogyna. Bosemann, 50; Fant, 20; 



Schneider, f. 110, 172. G. mollis. Hitchcock (1), 4, (3), 15. 



C. nigra. Schneider, f. 174. G. Oxyacantha. Bosemann, 50; 



Fant, 26, f. 23; Schneider, f. 174; Ward, 1:194, f. 97-98; Will- 



komm, 8, 10, 31, f. 41. G. punctata. Otis,. 150. G. sanguinea. 



Schneider, f. 172. G. tanacetifolid. Schneider, f. 173. C. to- 



mentosa. Brendel, pi. 3; Hitchcock (1), 4. 



