48 KEY TO THE SPECIES 



sharply toothed or incised ; flowers in an umbel-like corymb, eepals and petals 

 light green, sub-equal ; the petals spatulate ; stamens 8 ; winged fruit 2-3 cm. 

 long. Frequent in canons. 



3. Acer Negundo L. (Box Elder). A low, widely branched tree ; the leaves 

 3-5-foliate, with ovate toothed strongly- veined leaflets which are pubescent when 

 young, glabrate in age ; flowers small, green, dioecious, drooping ; the staminate 

 in close clusters ; the pistillate in i-acemes ; wings broad and incurved. 



XXXVIII. VITACEiE (Vine Family) 



Shrubs usually climbing by tendrils, •with alternate simple 

 or compound palmate leaves, small flowers, minute calyx, 4 or 

 5 petals with as many stamens opposite them, a 2-celled ovary, 

 and fruit a berry, usually 4-seeded. 



1. Vitis. Plants climblD^ by the coiling of naked-tipped tendrils ; leaves 

 simple. 



2. Farthenocissus. Plants climbing by sucker-like disks at the tips of 

 tendrils ; leaves palmately compound. 



1. VITIS (Grape) 



Shrubs climbing by the coiling of naked tendrils, with simple rounded and 

 heart-shaped leaves, very fragrant clusters of flowers, with petals falling off with- 

 out opening, and a short style or none. 



1. Vitis vulpina li. (Riverside Grape). Glabrous ; climbing over bushes and 

 rocky ledges ; leaves thin, with 3-7 acute lobes ; panicles rather crowded ; fruit 

 black with bloom, 6-8 mm. in diameter. 



3. FARTHENOCISSUS 



Shrubs climbing by tendrils fixing themselves by sucker-like disks at the tips, 

 with palmately compound leaves, and thick petals expanding before they fall. 



Farthenocissus laciniata (Planch) Aven Nelson, (Virginia Creeper. 

 Woodbine). Climbing extensively : leaflets 5, lance-oblong, cut-toothed, chang- 

 ing to crimson in autumn ; berries small, black or bluish. Low or rich ground. 

 (See Plant Relations, p. 63, Figs. 53, 54.) 



XXXIX. MALVACEiE (Mallow Family) 



Herbs or shrubs with alternate leaves, 5 sepals united at 

 base, 5 petals, numerous stamens united into a column, and 

 numerous ovaries united into a ring or forming a several-celled 

 pod. 



1. MalTa. Flowers with a 3-leaved involucre at base ; petals whitish, fruit a 

 ring of blunt carpels ; stigma lateral. 



2. Malvastrum. Flowers with 1-3-leaved involucre or none ; petals pinkish- 

 red ; fruit separating into beaked carpels ; stigma capitate, terminal. 



