RUTACEAE (RUE FAMILY) 



4 a Flowers red or pink. .FLOWERING FLAX. (L. grandifldrum.*) 

 b Flowers blue or white 5 



5 a Leaves linear; styles and stamens of different lengths 



in different flowers; plant perennial 



PERENNIAL FLAX. (L. perenne.*) 



b Leaves lanceolate; styles and stamens not of different 

 lengths in different flowers; plant annual 



COMMON FLAX. (L. usitatissimum.*) 



5 RUTACEAE. Rue Family. 



1 PHELLODENDRON CHINESE CORK TREE. (P. amurense*) 



2 XANTH6XYLUM PRICKLY ASH. (X. americanum.) 



3 PTfeLEA SHRUBBY TREFOIL. (P. trifoliata.) 



4 CITRUS. 



1 a Leaves 3-foliolate TRIFOLIATE ORANGE. (C. trifoliata*) 



b Leaves simple 2 



2 a Leaves 1-2 in. long, lanceolate; fruit flattened-globose, 



orange TANGERINE. (C. nobilis.*) 



b Leaves 2-5 in. long, ovate to oblong 3 



3 a Young branches hairy, greenish ; fruit globose, yellow 



GRAPE-FRUIT. (C. decumana.*) 

 b Young branches not hairy, reddish or greenish 4 



4 a Fruit ovoid to oblong, yellow ; leaves oblong to oval 



LEMON. CITRON. (C. mtdica*) 

 b Fruit globose, orange; leaves ovate 



ORANGE. (C. aurdntium.*) 



5 DICTAMNUS GAS PLANT. (D. dlbus*) 



6 SIMARUBACEAE. Ailanthus Family. 



i AILANTHUS AILANTHUS. (A. glandulbsa.) 



7 POLYGALACEAE. Milkwort Family. 

 i POLYGALA. 



1 a Flowers 1-4 together, Vz-i in. long, showy; leaves 



rather ovate FRINGED MILKWORT. (P. paucifblia.) 



b Flowers not completely as in a 2 



2 a Flowers showy, in loosely-flowered racemes 1-4 in. 



long RACEMED MILKWORT. (P. polygama.) 



b Flowers in heads or spikes 3 



3 a Leaves in whorls on the stem 4 



b Leaves alternate on the stem 5 



4 a Spikes oval; stem angled .. MARSH MILKWORT. (P. cruciata.) 

 b Spikes conic ; stem circular, not angled 



WHORLED MILKWORT. (P. verticillata.) 



5 a Spikes globose to oval ; flowers usually red-purple 



PURPLE MILKWORT. (P. viridescens.) 

 b Spikes" oblong; flowers greenish or yellowish-purple 



NUTTALL'S MILKWORT. (P. nuttallii.) 



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