530 GERANIACEAE 



Family 66. GERANIACEAE. Geranium Family. 



Herbs, with opposite leaves with stipules; blades in ours palmately lobed 

 or divided. Flowers perfect, regular, cymose, or subumbellate. Sepals 5, 

 imbricate. Petals 5, deciduous. Stamens 10, rarely 5; filaments mona- 

 delphous. Gynoecium of 5 carpels, the styles of which are adnate to an 

 elongate central column, from which they separate at maturity. Carpels 

 2-ovuled, but 1-seeded. 



Carpels rounded, their tails (styles) glabroiis within, merely recoiling at maturity; leaves 

 in ours palmately veined and lobed. 1. Geranium. 



Carpels spindle-shaped, their tails (styles) pubescent within, spirally coiled at maturity; 

 leaf-blades in ours pinnately veined, pinnately lobed or dissected. 2. Erodium. 



1. GERANIUM (Tourn.) L. Cranebill, Wild Geranium. 



Annual or perennial herbs, with opposite leaves. Leaf-blades palmately 

 lobed or parted. Flowers cymose, perfect, regular. Sepals 5, usually awn- 

 tipped. Petals .5, often pubescent near the base, not clawed. Stamens 10, 

 rarely only 5; filaments ciUate at the base, more or less united, monadelphous. 

 Scyle column usually beaked, the styles glabrous within, recoiled but not spirally 

 twisted, when freed from the axis. Carpels turgid, permanently attached to the 

 styles. Seeds smooth, reticulate or pitted. 



Petals 2-7 mm. long, at most slightly exceeding the calyx; plants annual or biennial, or 

 sometimes perennial in G. thermale. 

 Sepals not bristle-tipped; seeds smooth. 



Carpels wrinkled; stamens 10. 1. G. molle. 



Carpels finely pubescent; stamens 5. 2. G. pusillum. 



Sepals awn-tipped ; seeds reticulate or pitted. 

 Awn-tips less than 1 mm. long. 



Seeds reticulate; pedicels slightly hirsute, not glandular. 3. G. thermale. 

 Seeds pitted; pedicels glandular-pubescent. 4. G. rotundi folium. 



Awn-tips 1-2 mm. long. 



Beak and branches of the style less than 3 mm. long. 5. G. carolinianum. 

 Beak and branches of the style more than 4 nun. long; inflorescence open. 



6. G. Bicknellii. 

 Petals 1-3 cm. long; plants perennial, with rootstocks or caudices; seed reticulate. 

 Petals white; style-column and carpels glandular. 



Leaf-blades thin, sparmgly liirsute beneath; upper petioles retrorsely hirsute or 



glabrous; sepals slightly if at aU glandular. 7. G. Richardsonii. 



Leaf-blades thick, strigillose beneath; upper petioles canescent; sepals densely 

 glandular-pubescent. 

 Leaf-blades with long lanceolate lobes ; veins of the petals very strong. 



8. G. nervosum. 

 Leaf-blades with short ovate lobes ; veins of the petals rather weak. 



17. G. Cowenii. 

 Petals purple or rose. 



Plants with simple rootstocks or caudices; stem erect and simple below; style- 

 colunm glandular-pubescent. 

 Stem and petioles glandular- viscid ; petals strongly veined. 



9. G. viscosissimum. 

 Stem and petioles retrorsely hairy, not glandular-viscid. 



Petioles of the upper leaves minutely puberulent; petals strongly veined. 



10. G. strigosum. 

 Petioles of the upper leaves with long hairs; petals faintly veined. 



Stem nearly glabrous, sparingly liirsute; leaves short-strigose ; inflor- 

 escence open. 11. G. incisum. 

 Stem and leaves densely hairy; inflorescence congested. 



12. G. canum. 

 Plants with cespitosely branched caudices; stems usually diffusely branched. 

 Petals obcordate to broadly obovate, light purple, with darker veins. 

 Stem glandular-villous with long spreading hairs. 



Divisions of the leaves much longer than broad, with ovate or lanceolate, 



acute teeth. 13. G. Parryi. 



Divisions of the leaves about as broad as long, with broadly ovate, 

 abruptly short-acuminate teeth. 14. G. Pattersonii. 



Stem, petioles, and caly.x with short grajash pubescence. 

 Pedicels and style-column densely glandular-pubescent. 



Leaves with broadly ovate teeth; petals distinctly emarginate. 



1.5. G. Fremontii. 

 Leaves with lanceolate or lance-ovate teeth; petals scarcely emar- 

 ginate. 16. G. caespilosum. 

 Pedicels not glandular-pubescent; style-column rarely so. 



