658 GERANIACEAE 



below into a lanceolate-subulate auricle ; leaflets 2, the blades narrowly linear or linear- 

 elliptic, 1-5 cm. long, acute : peduncles 2-5 cm. long, 1-2-flowered : pedicels 2-3 mm. 

 long : calyx glabrous ; tube turbinate-campanulate ; lobes subulate-lanceolate, longer than 

 the tube : corolla purple ; keel-petals 6-7 mm. long: pods linear, 1.5-4 cm. long. 

 In sandy soil, North Carolina to Florida and Texas. Spring. 



2. Lathy i us myrtifolius Muhl. Perennial, glabrous. Stems freely branching, the 

 branches 3-10 dm. long, angled : leaves 5-15 cm. long ; rachis ending in a forking tendril ; 

 stipules half-sagittate ; leaflets 4-8, the blades elliptic to oval, 1.5-4 cm. long, mucronate, 

 glaucous beneath and prominently nerved : peduncles 5-1 2 cm. long, curved, 3-8-flowered : 

 pedicels 1-4 mm. long : calyx campanulate ; tube ribbed ; lobes lanceolate, about as long 

 as the tube, or the shorter ones triangular-lanceolate : corolla purple or blue ; keel-petals 

 12-15 mm. long : pods linear, 4-6 cm. long, each with a short curved beak. 



In damp places, New Brunswick to Manitoba, North Carolina and Tennessee. Spring and summer. 



3. Lathyrus venosus Muhl. Perennial, usually minutely pubescent. Stems branch- 

 ing, 4-10 dm. long, trailing or climbing, 4-angled : leaves 1-3 dm. long ; stipules lan- 

 ceolate to ovate, half-sagittate, entire, or toothed at the base ; leaflets 8-14, the blades 

 firm, ovate, oval, elliptic or oblong, mucronate, more or less glaucous beneath, often con- 

 spicuously nerved : peduncles 5-15 cm. long, many-flowered, shorter than the leaves : 

 pedicels 2-4 mm. long : calyx campanulate ; lobes lanceolate, acuminate, the longer ones 

 as long as the tube : corolla purple ; keel-petals about 1.5 cm. long : pods linear, 3.5- 

 4.5 cm. long, prominently nerved. 



On river banks, Assiniboia to New Jersey, Georgia, Louisiana and Kansas. Spring and summer. 



Order 15. GERANIALES. 



Herbs, shrubs or trees. Leaves alternate or opposite : blades simple or 

 compound. Flowers perfect, monoecious or dioecious, variously disposed, 

 mostly regular. Calyx of distinct sepals. Corolla of distinct or nearly dis- 

 tinct petals, rarely wanting. Androecium of as many stamens as there are 

 sepals, or twice as many, or rarely more. Filaments distinct or united. An- 

 thers opening lengthwise, distinct, or united in BALSAMINACEAE. Gynoecium 

 of 2 or several united carpels, superior. Ovules pendulous, 1 or 2 in each cavity, 

 the raphe turned toward the axis of the gynoecium. Seeds various. 



Plants destitute of secreting glands or cells in the tissues. 

 Sepals without dorsal glands. 



Styles united around a central column from which they break at 



maturity. Fam. 1. GERANIACEAE. 



Styles distinct or permanently united. 



Flowers very irregular : one sepal spurred : anthers united. Fam. 2. BALSAMINACEAE. 



Flowers regular : no sepal spurred : anthers distinct. 



Styles distinct or partially united, the tips and the stigmas 



distinct. 



Leaves simple : stamens 5. Fam. 3. LINACEAE. 



Leaves compound : stamens 10-15. Fam. 4. OXALIDACEAE. 



Styles and stigmas permanently united. 



Filaments normally appendaged : seed straight or nearly so. Fam. 5. ZYGOPHYLLACEAE. 

 Filaments unappendaged : seed strongly bent. Fam. 6. KOEBEELINIACEAE. 



Sepals bearing 1 or 2 dorsal glands (except Thryallis). Fam. 7. MALPIGIACEAE. 



Plants with secreting glands, these often in the leaves, or only in the bark. 

 Filaments distinct, nearly or quite to the base. 



Leaf-blades punctate by oil-glands. Fam. 8. RUTACEAE. 



Leaf-blades not punctate. 



Gynoecium of distinct carpels. Fam. 9. SURIANACEAE. 



Gynoecium of more or less united carpels. 



Bitter-barked shrubs or trees with oil-sacs in the bark. Fam. 10. SIMARUBACEAE. 



Resiniferous shrubs or trees. Fam. 11. BURSERACEAE. 



Filaments united into a cup or tube, wholly or in part. Fam. 12. MELIACEAE. 



FAMILY 1. GERANIACEAE J. St. Hill. GERANIUM FAMILY. 



Herbs or shrubby plants, usually caulescent and leafy. Foliage generally 

 pubescent or glandular. Leaves alternate or opposite : blades usually lobed or 

 dissected. Flowers perfect, regular, sometimes solitary. Calyx of mostly 5 

 persistent sepals. Corolla of mostly 5 hypogynous petals, deciduous. Androe- 

 cium of aa many stamens as there are sepals or 2-3 times as many. Filaments 

 distinct. Anthers 2-celled, versatile. Gynoecium of 5 united carpels. Ovary 



