IDENTIFICATION OF PLUM X'ARIETIES 



Figure 3. Glands. (2 X) 



1. SANTA ROSA — 2, small, reniform. on the blade: 



2. GERMAN PRUNE — 2, small, round, on the blade: 



3. IMPERIAL GAGE — 2, medium in size, round, on the petiole, with depressed centers; 



4. IMPERIAL EPINEUSE — 2, rather small, round, stalked, close to the blade; 



5. PEARL — 2, rather small, usually round, leafy-stalked, on the petiole: 



6. CALIFORNIA BLUE — 2, large, reniform, stalked, down on the petiole; 



7. MONITOR — 2, medium in size, reniform, close to the blade: 



8. ABUNDANCE — 2-4, medium in size, reniform, scattered: 



9. BURBANK — 2-6, medium in size, mostly reniform, scattered: 

 10. FORMOSA — numerous, moderately small, round, scattered. 



The glands are extremely valuable characters in the identification of plum 

 varieties. Glands vary in number, size, shape, and position as illustrated in 

 Figure 3. They are usually 2 in number and are placed side by side on the upper 

 surface of the petiole close to the blade; but with some plums, particularly Jap- 

 anese, the gland number is typically more than 2. Abundance has 2-4, Burbank 

 2-6, and Formosa many. Glands are apt to be rather small but with many 

 varieties they are medium-sized, and with a few, as California Blue, they are 

 large. The globose or round gland shape is most general, but reniform or kidney- 

 shaped glands are not uncommon as in California Blue, Santa Rosa, Abundance, 

 and others. A few varieties have more or less stalked or leafy-stalked glands 

 as in Imperial Epineuse and Pearl, respectively (see Figure 3). Further, glands 

 may be pitted or have depressed centers as in Imperial Gage. Gland position 

 is worth noting. They may be on the blade as in German Prune, close to the 



