Dicotxis or Exogenous' Plants. 29 



Hic-o'-ri-a min'-i-ma (Marsh.) Britt. {Carya amara Nutt.) Bitter- 

 nut; Swamp Hickory. — Buds yellowish, leaflets 7-11, lanceolate: fruit 

 globular, narrowlv (i-ridged; nut globular, short pointed, white, thin- 

 walled. 



XI. Order IWYR-I-CA'CE/E. SWEET GALE FAMILY. - Shrubs; flowers 

 in short scaly catkins; leaves resinous, sometimes fragrant; fruit a 

 nut-like drupe. 



Leaves pinnatifid with many rounded lobes Comptonia. 1 



Leaves entire, or somewhat serrate Myiica. '1 



1. Genu'^ COiVIP-TO'-NI-A. — Low shrub; fertile catkins globular, 

 ovary surrounded by 8 linear subulate persistent scales. 



Comp-to'-ni-a per-e-gri'-na (L.) Coult. {Myrica asplenifolia Endl.) 

 Sweet Fern. — Leaves sweet scented, fern-like, linear-lanceolate, stipules 

 semi-cordate. 



2. Genus IVIY-RI'-CA.— Shrub, 3-8 ft. high; fertile catkins ovoid; 

 ovary with "2-4 scales at the base. 



IVIy-ri -ca ce-rif'-er-a L. Bayberry: Wax Myrtle. — Leaves oblong lance- 

 olate, somewhat preceding the flowers, fragrant; sterile catkins scat- 

 tered. 



XIL Order SAL-I-CA -CE ^E. WILLOW FAMILY.— Trees or shrubs; 

 flow'ers in catkins; fruit a 1-celled, 2-valved pod; seeds with silky 

 down. 



Bracts lacerate, stamens numerous, stigmas elongated Populiis. 1 



Bracts entere, stamens few, stigmas short Salix. 2 



1. Genus POP'-U-LUS. — Flowers with a cup-shaped disk, obliquely 

 lengthened in front; stamens 8-30 or more; buds scaly; trees with 

 broad leaves. 



A. styles zuiih 2 or 3 nairo'M filiform lobes. 



(b. Petioles laterally fattened ; brads silky.. 



Pop'-u-lus al'-ba. White Poplar. — Younger branches and under sur- 

 face of the oval sinuate-toothed, acute leaves, white tomentose. Cul- 

 tivated, sometimes escaped. 



Pop'-u-lus trem-u-loi'-des Mx. American Aspen. — Leaves roundish 

 cordate, teeth small, somewhat regular; scales cut into 3-4 linear 

 divisions, fringed with long hairs. 



