8 University of California Publications in Agricultural Sciences [Vol. 2 



flowers. Staminate flowers in lateral catkins from wood of the preceding 

 year; calyx adnate to the inconspicuous dark-rod bract, irregular, con- 

 sisting of three larger and one or two smaller lobes and an inner whorl 

 of 4 to 6 smaller distinct sepals, one or two of which sometimes show 

 stamen characters; stamens sepaloid, 10 to 13, with 1 to 4 of the central 

 ones abortive; filaments free, very short; anthers variable, the pollen sacs 

 unequal, especially in the outermost stamens, connective not bifid at the 

 top. Pistillate catkins 3 to 6-flowered, terminating branchlets of the 

 same season's growth; calyx irregularly 4 to 7-lobed, adherent to the 

 inferior 1-celled ovary; the latter often with 1 or 2 longitudinal grooves 

 or ridges, rarely with 2 or 3 fleshy bracts near the base, occasionally 

 with abortive anthers; styles 3 or 4, short, united toward the base oi 

 free, stigmatic along the inside, the fringed surfaces forming a rosette. 

 Fruit similar in appearance to that of Juglans calif ornica Wats., but 

 smaller and more variable as to form and internal structure of the nut; 

 the seed also much smaller; cotyledons much reduced, not convoluted (cf. 

 plate 1, figure 1, plate 2, figures 2 and 3, plate 3, figures 4 and 5, plate 4, 

 figure 6, g, h, i, j, k, I, plate 5, figures 7 and 8, plate 6, figure 9, plate 11, 

 figures 17 and 18). 



Differences between the New Form and the Species Type 



J. calif ornica 



Leaves, 6 to 13 inches long, com- 

 pound with 11-19 leaflets. 



Terminal leaflet shorter than, equal 

 to, or longer than the lateral 

 leaflets and ranging from 1% 

 to 4 inches long, oblong lance- 

 olate, serrate. 



Staminate floivers. Calyx irregu- 

 larly 3 to 6-lobed; stamens 20 

 to 26, connective bifid at the 

 apex. 



Pistillate flowers. 

 styles 2. 



Calyx 4-lobfid; 



Fruit globose, % to 1 inch in 

 diameter; cotyledons promin- 

 ent, much convoluted. 



J. calif ornica var. quercina 



Leaves 1 to 3 inches long, mostly 

 compound with 3 leaflets, rarely 

 with 5, sometimes simple. 



Terminal leaflet two or three times 

 as long as lateral leaflets and 

 ranging from % to 2 inches in 

 length, in form varying from 

 broadly ovate through oval to 

 elli])tical or oblong, truncate or 

 emarofinate at the apex, margin 

 serrate or almost entire. 



Staminate flowers. Calyx adnate to 

 the inconspicuous dark red 

 bract, irregular with 3 larger 

 and 2 smaller lobes and inner 

 whorls of 4-6 smaller distinct 

 sepals; stamens sepaloid, 10 to 

 13, anthers variable, connec- 

 tive not bifid at apex. 



Pistillate floivers. Calyx irregular- 

 ly 4 to 7-lobed; styles 3 or 4, 

 short, the fringed surfaces 

 forming a rosette. 



Fruit smaller and more variable as 

 to form and internal structure; 

 seed much smaller, cotyledons 

 much reduced, not convoluted. 



