KEY FOR MARCH, APRIL AND MAY 



12 a Leaves 3-6 in. long, in whorls at the ends of the branches 



Sciadopitys. p log 

 b Leaves 2 in. or less long 13 



13 a Each leaf extending down the stem, not jointed to it; 



leaves awl-shaped ; small cultivated tree 



Cryptomeria. p log 

 b Each leaf jointed to the stem, not extending down it as 



in a 14 



14 a Leaves thick, somewhat 4-sided; branchlets very rough 15 

 b Plants not completely as in a 16 



15 a Leaves about % in. long; native shrub. .. .Corema. p 180 

 b Leaves usually more than ^4 in. long Picea. p 108 



1 6 a Leaves rather rigid, tapering to apex, somewhat chan- 



neled 17 



b Leaves flat, not channeled or tapering 18 



17 a Native shrubs; leaves sometimes arranged in 3's on the 



stem Juniperus. p log 



b Cultivated shrubs; leaves arranged in 4 rows on the 



stem Chamaecy paris. p log 



18 a Branchlets covered with small projections, rather rough 19 

 b Branchlets without projections, rather smooth 20 



19 a Leaves about % in. long, blunt at apex, whitish be- 



neath when fresh Tsuga. p 108 



b Leaves %-i in. long, pointed at apex, green beneath 



Taxus. p 107 



20 a Leaves thin, deciduous, appearing only on new branches 



Tax odium, p log 

 b Leaves comparatively thick, appearing on 2-year-old 



branches Abies, p 108 



Trees or Shrubs With Opposite, Compound Leaves 



21 a Leaves or leaf-scars opposite on the branches 22 



b Leaves or leaf-scars alternate on the branches 49 



22 a Leaves compound 23 



b Leaves simple or wanting at flowering time 28 



23 a Leaves palmately compound; flowers irregular. 



Aesculus. p 183 

 b Leaves not palmately compound ; flowers regular .... 24 



24 a Flowers %-i in. broad, yellow Jasminum. p ig8 



b Flowers % in. or less broad 25 



25 a Flowers V^-Vz in. long, bell-shaped, in pendulous ra- 



cemes Staphylea. p 182 



b Flowers not completely as in a 26 



26 a Flowers white, in cymes Sambucus. p 214. 



b Flowers not in cymes 27 



27 a Petals 4, white; leaflets 7-11 Fraxinus ornus. p ig8 



b Perianth parts green; leaflets 3-5 Acer negundo. p 182 



4 



