SALICACEAE 67 



Bark of tree close and rough. 



Leaflets 11 or more. 1. H. Pecan. 



Leaflets 9 or less. 

 Branohlets glabrous. 

 Husk of fruit strongly ridged. 2. B. minima. 



Husk not ridgfed. 3. S. nlloaa. 



Branohlets strongly pubescent. 4. H. alba. 



Bark of tree exfoliating in long narrow plates. 



Nut 6"-W long. 5. E. ovata. 



Nut \^"-W long. 6. H. ladniosa. 



1. H. Pecan (Michx.) Britton. Pecan. Bud-scales valvate : leaf- 

 - lets usually 11, lanceolate to oblong-lanceolate, strongly falcate, glabrate : 



husk thin, tardily splitting, ridged]; nut oblong-elliptic, not ridged, with 

 thin shell : seed sweet. — Four trees along a creek southwest of Lone Jack. 

 Reported elsewhere. 



2. H. minima (Marsh.) Britton. Pignut. Bud-scales 6-8, valvate : 

 leaflets usually 7, lanceolate to oblong-lanceolate, the lateral one falcate, 

 strongly resinous and glandular beneath : husk thin, tardily splitting : 

 nut-shell thin : seed bitter. — A common forest tree. May-June. 



3. H. vlllosa (Sarg.) Ashe. Pignut. Bud-scales 6-8, imbricated, the 

 outer resinous- dotted : leaflets 5-9, more or less pubescent and resinous- 

 dotted : fruit obovoid, 1' or more long, splitting nearly to the base : nut 

 thin-shelled, angled. — Frequent in dry woods in the eastern part. May- 

 June. 



4. H. alba (L.) Britton. Mockbk-nut. Bark fragrant : bud-scales 

 8-10, large, imbricated : leaflets 7-9, oblong-lanceolate to obovate : husk 

 thick, soon splitting : nut thick-shelled, pointed at the summit. — A com- 

 mon forest tree. May-June. 



5. H. ovata (Mill.) Britton. Shell-BARK Hickoey. Bud scales 8- 

 10, imbricated : leaflets 5-7, oblong-lanceolate to obovate, very sparingly 

 glandular beneath : husk thick, splitting soon : seed sweet. — A common 

 forest tree. May-June. 



6. H. lacinioaa (Michx. f.) Sarg. King-nut. Like the last but leaf- 

 lets 7-9, more downy, strongly glandular beneath: fruit 2'-3'' long, with 

 a very thick husk: nut thick-shelled and pointed at both ends. — In rich 

 bottoms throughout but never common. May-June. 



Family 29. SALICACEAE Lindl. 

 Trees or shrubs with dioecious flowers In catkins, and alternate stipu- 

 late leaves. Flowers solitary in axils of bracts, without floral envelopes. 

 Staminate flowers consisting of 1-many stamens, the pistillate of a 1-oelled 

 ovary, bearing many ovules on 2-4 parietal placentae. Stigmas 2. Style 

 small or absent. Seeds provided with long silky down. 



Bracts lacerate ; stamens numerous. 1. Populus. 



Bracts entire : stamens 2-10. 2. Salix. 



