NORTH AMERICAN FLORA 



[Volume 25 



G. sibiricut 



G. molle. 

 G. pusilluh 



G. thermal e. 

 G. rotundifolii 



G. texanum. 



8. G Langloisii. 



9. G. carolinianum, 



not markedly differentiated into claw and blade. Stamens 10, or rarely 5 ; filaments usually 

 ciliate near the base. Style-column usually beaked, the styles glabrous within, not spirally 

 twisted when freed from the axis. Carpel-bodies turgid, permanently attached to the styles, 

 rounded at the base, not appendaged at the top. Seeds smooth, reticulate or pitted. 

 Type species, Geranium sylvaticum L. 



Plants annual or biennial, or perhaps sometimes perennial in G. thermale. 

 Peduncle terminated by a single pedicel. 1 



Peduncle terminated by a pair of pedicels. 

 Seeds smooth ; sepals without subulate tips. 



Carpel-bodies wrinkled ; stamens 10. 2 



Carpel-bodies pubescent ; stamens 5. 3 



Seeds reticulate or pitted ; sepals with subulate tips. 

 Sepal-tips less than 1 mm. long. 



Seeds reticulate ; pedicels slightly hirsute, glandless. 4 



Seeds pitted ; pedicels glandular-pubescent. 5 



Sepal-tips 1-2 mm. long. 



Style-beak and branches less than 3 mm. long. 

 Seeds pitted. 



Style-column glandular-pubescent ; carpel-bodies pu- 

 bescent with minute spreading hairs ; petioles and 

 pedicels hirsute. 6 



Style-column pubescent with glandless hairs ; carpel- 

 bodies pilose with erect hairs ; petioles and pedi- 

 cels retrorseW pubescent. 7 

 Seeds reticulate. 



Blades of the upper leaves not much more finely di- 

 vided than those of the lower ; carpel-bodies 

 merely pilose. 

 Inflorescence open, few-flowered. 

 Inflorescence compact, many-flowered. 

 Blades of the upper leaves conspicuously more finely 

 divided than those of the lower : carpel-bodies 

 glandular-pubescent. . 10 



Style-beak and branches more than 4 mm. long. 



Peduncles appressed-pubescent or with retrorse gland- 

 less hairs. 

 Outer sepals 10-12 mm. long. 11 



Outer sepals 6-8 mm. long. 12 



Peduncles glandular-villous. 13 



Plants perennial by tap-roots or rootstocks, often with stout caudices. 

 Sepals without awn-tips. 

 Sepals with manifest awn-tips. 



Peduncle terminated by a pair of pedicels, or more. 

 Petals less than 1 cm. long. 



Introduced plants with thick or fleshy tap-roots ; fruit 

 beakless. 

 Leaf-divisions flabellate, the ultimate segments narrow ; 



petals orbicular-obovate. 

 Leaf-divisions cuneate, the ultimate segments broad ; 

 petals cuneate. 

 American plants with rootstocks or caudices ; fruit beaked. 

 Petals hardly as long as the sepals; plant of the north- 

 western United States. 4. 

 Petals markedly longer than the sepals ; plants of Mexico 

 and Central America. 

 Pedicels and calyx not glandular-pubescent. 

 Petals pink or rose-colored. 



Peduncles and pedicels strigillose. 17. 



Peduncles and pedicels hirsute or loosely re- 

 trorse-hirsute. 

 Petals slightly longer than the sepals ; 



sepals hirsute. 18. 



Petals about twice as long as the sepals ; 

 sepals appressed-pubescent. 19. 



Petals white. 20 



Pedicels and calyx more or less glandular with long 

 spreading hairs. 

 Petals colored. 



Petals about twice as long as the sepals, 

 strongly veined. 

 Leaf-divisions cuneate, coarsely toothed to 

 somewhat cleft, the terminal lobes or 

 teeth triangular or ovate. 21. 



Leaf-divisions flabellate in outline, deeply 

 cleft, the terminal lobes or teeth linear. 22. 

 Petals slightly longer than the sepals, veinless. 23. 



(,'. columbim 

 G. nemorale. 

 G. Bicknellii 



14. G. pyrenaicut 



15. G. retrorsitm. 



16. G. glabralum. 



G.flacddun 



(,'. 



regale. 

 Wislizeni. 



mexicanum. 



radiaium. 

 vulcanicola. 



