SOME CAWFORNIAN MAPI<KS. 251 



quite setulose under a lens, the setulae pointing forwards, 

 lower face more stiffly setulose, but on the veinlets only, the 

 veins proper with spreading hirsute hairs along their sides at 

 and near their bases : racemes long and large ; samaras about 

 Hi inches long, moderately divergent, but wings excessively 

 widened, fC inch wide in the middle and over-lapping, glabrous 

 or very nearly so, the body densely bristly, but almost at 

 summit only, the tomentellous indument very scanty and 

 obscure. 



Known only in a very good sheet of specimens (U.S. Herb. 

 469326), brought from Round Valley, Mendocino Co., in 1897, 

 by V. K. Chesnut. The leaves almost as much dissected as 

 in the last species, but very differently so, the segments even 

 almost closing the sinuses. The wings of the samaras are the 

 broadest known in the genus. 



Acer auritum. I<eaves pale and glaucescent above, there 

 setose along the mid vein and veinlets, the general surface 

 rather closely muriculate, many of the points minutely bristle- 

 tipped, the lower face, at least in full maturity, of a yellowish 

 or subfuscous green and more sparsely muriculate and setulose, 

 the segments palmate, broad (showing quite V-shaped sinuses), 

 widening upwards and doubly lobed, i. e. the terminal sec- 

 ondary lobe itself conspicuously 3-lobed, the pair of basal 

 lobes subdivided on the margin next the petiole, producing 

 each a secondary lobe which two, ear-like, approach the petiole 

 somewhat hastately or sagittately : fruiting racemes very 

 large, commonly 6 or 7 inches long, 4 inches across, the area 

 of each exceeding that of the largest leaves : samaras iM 

 inches long, diverging to form by their bases a long quadrate 

 sinus, the whole body very hirsute, but shortly so, also tomen- 

 tose underneath the hairs, the broad wings nearly glabrous. 



Tree of Napa Valley and its immediately tributary wooded 

 canons, first collected by Brewer, on the State Survey (n. 1316), 

 later by Pringle (25 Aug. 1882) at Calistoga at the head of the 

 valley. The leaves of the species are of only a fourth or a 

 third the size of A. macrophyllum, and extremely unlike them 



