ROSACEAE— FABACEAE 



27 



' in Bcaly umbels or corymbs, expanding with i 



the leaves 



(a) Branches usually thorny or armed; fruit sub-globose, borne 



singly Plums 

 x. Teeth of leaves obtuse, gland-tipped; stone flat P.ni 



y. Teeth of leaves acute, bristle-tipped: stone round P.americdna 



(b) Branches not thorn) or armed; fruit globose or sub-globo 



Cherries 

 \. Flowers in corymbs, small, petals 4-6 mm. long; fruit 3-6 mm. P. pennsylv&nica 

 y. Flowers in umbels, large, petals 8-12 mm. long; fruit 8-15 



mm. /'. cirasus 



1). Dwarf shrubs (1-4 ft.), with narrow leaves 



(1) Shrub with wand-like branches; leaves thin P.pnmila 



(2) Bushy shrub; leaves thick P. Bcsscyi 

 Flowers double or filled Flowering Almonds and Plums 



a. Leaves lanceolate; flowers 2-3 cm. broad P. japonica 



b. Leaves ovate, mostly 3-lobcd ; flowers 3-5 cm. broad P. triloba 



( iet'iin- \\ ens 



(L. groom, avens) 

 PI. 10, fig. D : 1, 2 



1. Leaflets 1-9; style jointed 



2. Leaflets many ; style not jointed 



Potentilla — t linqfi >il 



(L. potens, powerful) 

 PI. 10, fig. A 



1. Leaf pinnate, smooth above, quite hairy below 



2. Leaves palmately 5-foliate 



Fragaria — Strawberry 



(L. fragram, strawberry plant) 



1. Leaves thick, dark green ; berry round ; nutlets sunken in pits 



2. Leaves thin. light green; berry long; nutlets projecting 



G. rivale 

 G. ciliatum 



P. anserina 

 P. canadensis 



F. irirginidna 



P. americana 



Fabaceae — Pea Family 

 Herbs, shrubs, vines or trees with alternate mostly compound leaves; sepals 4-5, petals 5, rarely 

 fewer, stamens 10. usually in two groups, pistil 1, simple, 1-many-sceded : flower apopetalous, 

 hypogynous or perigynous, irregular. The typical flower of this family, e. g., the pea, has the 

 sepals united into an irregular cup. The petals are of three forms, an upper odd petal (standard), 

 two lateral spreading petals (wings) and the two lower ones (keel) more or less united and 

 enclosing the stamens and pistils. The stamens are usually united by their filaments in a group of 

 nine, the tenth stamen being free. 



I. Trees and shrubs 



1. Thorny trees; flowers white, in drooping racemes 



2. Thornless shrubs ; flowers yellow or purple 



a. Flowers yellow, 1-5 in a cluster 



b. Flowers purple, in dense erect spikes, only 1 petal 



II. Herbs 

 1. Leaves pinnate 



a. Leaflets more than 3 ; plants perennial 



(1) Leaves tendril-bearing at the tip 



(a) Style round, hairy-tufted al 



(b) Style flattened, bearded along the inner face 



(2) Leaves not tendril-bearing 



(a) Keel prolonged into a tip 



(b) Keel obtuse 



b. Leaflets 3: plants biennial 



Robinia 



Caragana 

 rpha 



Lathyrus 



. Ira gains 

 . istragalus 

 Melil 



