156 SAPIXDALES 



2. Hicoria. (Carya.) 323. 



Bud scales valvate, 4-8, falling soon after the bud opens, fruit 25-35 

 mm. long, husk thin with wing-like edges. 1. H. minima. 



Bud scales imbricated, 8-12, the inner elongating when the bud opens 

 and tardily deciduous, fruit 35 mm. or more long, not winged. 

 ?Tusk thick, nuts white or whitish, sweet, middle lobe of the stamin- 

 ate corolla twice as long as the lateral. 

 Leaflets 5, rarely 7, nut 10-20 mm. long. 2. H. ovata. 



Leaflets 7-9, nut usually larger. 



Young foliage pubescent, mature leaves slightly so beneath. 



3. H. laciniosa. 



Foliage and twigs persistently tomentose-pubescent, foliage 



fragrant. 4. H. alba. 



Husk thin, nut brown, bitter, leaflets 3-7; lobes of the staminate 



corolla about equal. 5. H. glabra. 



1. Hicoria minima (Marsh.) Britton. Bitter Nut. 

 Common along streams in the southeastern part of the state. Cass 

 County; Lincoln; Nebraska City; Platte River; Peru; Wabash; 

 Wymore. 



2. Hicoria ovata (:\Iill.) Britton. Shell-bark Hickory. 

 Along the Missouri in the southeastern part of the state. Nebraska 

 City; Peru; Plattsmouth; Richardson County. 



3. Hicoria laciniosa (Michx.) Sarg. 

 Rare in Richardson County. 



4. Hicoria alba (L.) Britton. 

 Southeastern Nebraska? 



5. Hicoria glabra (Mill.) Britton. Pig-nut. 

 Along streams in the southeastern part of the state. Nemaha; 

 Wabash; Weeping Water. 



5. BETULACEAE. 



Bracts of the staminate aments each with a single flower, nut neither 

 winged or margined. 

 Trees, pistillate flowers numerous in spike-like aments, nuts small, 

 4-5 mm. long. 

 Bracts flat, not enclosing the flower or fruit. 1. Carpi nus. 



Bractlets tubular, becoming bladder-like and enclosing the fruit. 



2. Ostrya. 



Shrubs, pistillate flowers few, 2-4, in capitate clusters, nuts 12 mm. 



long or more. 3. Corylus. 



Bracts of the staminate aments with 3-6 flowers each, nut winged 



or margined, i. e. a samara. 



Pistillate aments solitary, apparently axillary, scales thin falling 



soon after the seeds. 4. Betula. 



Pistillate aments clustered, scales thick, becoming woody, long 



persistent. 5. AInus. 



1. Carpinus. 326. 



1. Carpinus caroliniana Walter. Blue Beach. 



Reported from Sarpy County. 



