192 GERANIACEAE 



Great Lakes and on the Pacific coast. Also in northern Eu. and Asia. — 

 Pennsylvania : EriE, Presque Isle ; CLiNTOisr. 



2. Lathyrus ochroleucus Hook. Cream-colored Vetchling. (Man. 

 p. 568 ; I. F. 222\.) On river banks and hillsides, N. J., Pa. to N. Eng., 

 Quebec and Arctic Am., west to Iowa, N. Dak., Wash, and B. C. — Penn- 

 sylvania : Blair; Centre. 



3. Lathyrus venosus Muhl, Veiny Pea. (Man. p. 567 ; I. F./. 2216.) 

 River shores and banks, western N. J. and Pa. to Ind. and Assiniboia, 

 south to Ga., La. and Kans. — Pennsylvania : Northampton, Bethle- 

 hem ; York ; Perry ; Susquehanna ; Westmoreland. 



4. Lathyrus myrtifolius Muhl. MyrtlE-LEaved Marsh Pea. (Man. 

 p. 567 ; I. F. f. 221S.) In moist or wet grounds, N. B. to Man., south to 

 N. C. and Tenn. — Pennsylvania : Monroe ; Luzerne ; Northampton ; 

 Lancaster ; Berks ; Huntingdon ; Delaware. 



Order 15. GERANIALES. 



Stigmas or styles all distinct or all united, neither cleft nor foliaceous. 

 Anther-sacs opening by longitudinal valves. 



Plants destitute of secreting glands or cells in the tissues. 

 Styles united around a central column from which they break at maturity^ 



Fam. I. Geraniaceae. 

 Styles distinct or permanently united. 

 Leaves simple. Fam. 2. Linaceae. 



Leaves compound. Fam. 3. Oxalidaceae. 



Plants with secretingglands, these often in the leaves, sometimes in the bark. 

 Leaf-blades punctate by oil glands. Fam. 4. Rutaceae. 



Leaf-blades without oil glands. Fam. 5. Simarubaceae. 



Anthers opening by terminal pores. Fam. 6. Polygalaceae. 



Stigmas or styles distinct or cleft, or foliaceous, or united by pairs. 



Perianth present : stamens several, or only one when the flowers are in invo- 

 lucres ( i?z^/)/((3r6?"a). Fam. 7. EUPHORBIACEAE. 

 Perianth wanting : stamen solitary. Fam. 8. Callitrichaceae. 



Family i. GtERANIACEAE J. St. Hil. Geranium Family. 



Carpel-bodies turgid, the tails glabrous within : anthers 10, or rarely 5. 



I. Geranium. 

 Carpel-bodies narrow, the tails pubescent within : anthers 5. 2. Erodium. 



1. GERANIUM L. 



Carpel-bodies deciduous from the styles at maturitj', each with 2 fibrous ap- 

 pendages at the top : leaf-blades divided. I. G. Robertianum. 

 Carpel-bodies permanently united to the styles, unappendaged : leaf-blades 

 lobed, cleft or parted. 

 A. Annual or biennial plants : corolla less than 1.5 cm. wide. 

 Sepals without subulate tips : seeds smooth. 

 Carpel-bodies wrinkled : stamens 10. 2. G. molle. 

 Carpel-bodies pubescent : stamens 5. 3. G. pusillum. 

 Sepals with subulate tips : seeds reticulated or pitted. 

 Sepal-tips less than i mm. long. 4. G. rolundi/oltum. 

 Sepal-tips 1-2 mm. long. 



