Jones: Flora of Illinois, 40. Juglandaceae 105 



9. Leaves entire 5. pedicellaris 



9. Leaves glandular-serrulate. 



10. Leaves sericeous above 5. adenophylla 



10. Leaves glabrous or nearly so from the first. 



1 1. Twigs puberulent 5. cordaia 



1 1. Twigs glabrous 5. glaucoph\)lla 



8. Catkins sessile or nearly so. 

 12. Anthers red. 



13. Young twigs white-tomentose ; catkins about 2.5 cm. long 5. Candida 



13. Young twigs puberulent; catkins 1-1.5 cm. long 5. humills 



12. Anthers yellow. 



14. Scales yellowish or pink-fipped 5. bebbiana 



14. Scales dark brown. 



15. Catkins 10-18 mm. long 5. pellolaris 



15. Calkins 2-4 cm. long. 



16. Anthers 0.5 mm. long S. sericea 



16. Anthers 0.7-0.9 mm. long. 



17. Catkins slender, 5-8 mm. thick, with a few leafy-bracts at base 



5. cordata 



1 7. Catkins stout, dense, sessile, about 1 cm. thick, without leafy- 

 bracts at base S. discolor 



39. Myricaceae Dum. — Bayberry Family 



L CoMPTONiA Banks 



C. peregrina (L.) Coult. Sweetfern. Open v^'oods, n.e. III., not common. 

 Apr.-May. [^Myrica asplenifolia L.] 



40. Juglandaceae Lindl. — Walnut Family 



1 . Pith of twigs lamellate or chambered jstaminate catkins sessile or nearly so; leaflets 

 conduplicate in vernation; nut enclosed in an indehiscent husk 1. Juglans 



1 . Pith solid; staminate catkins slender, long-peduncled ; leaflets involute in vernation; 

 husk of nut splitting into 4 valves 2. Carya 



I. Juglans L. — Walnut 



1 . Lower surface of mature leaflets softly stellate-pubescent and somewhat 

 glandular; leaflets 7-19; upper margin of leaf-scar pubescent, straight or 

 curved; stamens 8-12; anthers brown; pith dark brown; fruit ellipsoid, 

 acute, viscid-pubescent; woods, not common. May. Butternut..../, cinerea L. 



1 . Lower surface of mature leaflets glandular-puberulent, shortly-pubescent 

 along the midvein, the terminal one rarely present; leaflets 11-23; upper 

 margin of leaf-scar notched, not pubescent; pith light brown; fruit sub- 

 globose, glandular; woods, common. May. Black Walnut. /. nigra L. 



2. Carya Nutt. — Hickory 

 (Hicoria Raf.) 

 1. Leaflets 9-17 (usually 13), lanceolate, acuminate, the lateral ones somewhat 

 falcate; bud-scales 4 or 6, valvate. 



2. Rachis and lower surface of leaflets pubescent; staminate catkins fascicled; 

 nut smooth, nearly terete; seed not bitter; river-bottom woods, com- 

 mon; apparently absent from the n. part of the state. Apr.-May. Pecan. 



