GERANIACEAE 659 



5-celled, superior. Styles 5, united into a column. Stigmas terminal. Ovules 

 1 or 2 in each cavity. Fruit capsular. Seed often solitary. Embryo straight, 

 with flat or plaited cotyledons. 



Anthers usually 10 : carpel-tails glabrous within : carpel-bodies rounded at the base. 1. GERANIUM. 

 Anthers 5 : carpel-tails pubescent within : carpel-bodies acute at the base. 2. ERODIUM. 



1. GERANIUM L. 



Annual or perennial, sometimes shrubby, caulescent herbs. Leaves alternate or oppo- 

 site : blades toothed, or usually deeply lobed or dissected : petioles furnished with stipules. 

 Flowers solitary or two together on axillary peduncles. Sepals 5, imbricated. Petals 5, 

 imbricated, alternating with 5 glands. Stamens 10, 5 longer alternating with 5 shorter, or 

 rarely only 5 : filaments distinct or slightly united at the base. Ovary 5-lobed, prolonged 

 into a beak formed by the united styles. Capsule 5-lobed, each lobe separating elastically 

 from an axis and curling back on the style. Seed solitary in each cavity. Endosperm scant 

 or wanting. CRANE'S-BILL. WILD GERANIUM. 



Plants annual or biennial : corolla less than 1 cm. wide. 

 Sepals without subulate tips : seeds smooth. 



Carpel-bodies wrinkled : stamens 10. 1. O. molle. 



Carpel-bodies pubescent : stamens 5. 2. G. pusillum. 



Sepals with subulate tips : seeds reticulated or pitted. 

 Seeds pitted. 



Style-column glandular-pubescent : carpel-bodies pubescent \yith minute 



spreading hairs : petioles and pedicels with spreading hairs. 3. G. dissectum. 



Style-column pubescent, not glandular : carpel-bodies pilose with erect 



hairs : petioles and pedicels retrorsely pubescent. 4. G. Texanum. 



Seeds reticulated. 



Inflorescence congested, normally many-flowered. 5. G. Carolinianum. 



Inflorescence open, few-flowered. 6. G. Langlaisii. 



Plants perennial from stout rootstocks : corolla over 2 cm. wide. 7. G. mactdatum. 



1. Geranium molle L. Annual or biennial. Stem branched at the base, the 

 branches spreading or decumbent, 1-5 dm. long, often forking, delicately pubescent : 

 leaf -blades reniform to orbicular- reniform in outline, 2-6- cm. broad, those of the lower 

 leaves 6-9-cleft, those of the upper 3-5-cleft or 3-5-parted, the segments toothed or lobed 

 at the apex : petioles pubescent like the branches : pedicels minutely but copiously glandu- 

 lar-pubescent : sepals awnless, the outer ovate to elliptic-ovate, 3-4 mm. long : petals deep 

 purple, somewhat longer than the sepals : stamens 10 : carpel-bodies 2-2.5 mm. long, 

 wrinkled : style-column 8-9 mm. long at maturity : seeds smooth. 



In waste places, Maine to Vancouver Island, North Carolina and Ohio. Introduced from Europe. 

 Spring and summer. 



2. Geranium pusillum Burm. Annual or biennial. Stem branched at the base, the 

 branches decumbent or prostrate, 1.5-5 dm. long, forking, pubescent : leaf-blades reniform 

 in outline, 1.5-5 cm. broad, 5-7-parted, the segments toothed or lobed at the apex : peti- 

 oles puberulent and with few spreading hairs : pedicels minutely glandular-pubescent : sepals 

 awnless, the outer elliptic to ovate-elliptic, 2.5-4 mm. long : petals violet, often pale, longer 

 than the sepals : stamens 5 : carpel-bodies about 2 mm. long, finely pubescent : style-column 

 8-9 mm. long, finely pubescent : seeds smooth. 



In waste places and woods, Ontario to British Columbia, New Jersey, North Carolina, Nebraska 

 and Utah. Naturalized from Europe. Spring to fall. 



3. Geranium dissectum L. Annual or biennial. Stem often branched at the base, 

 the branches ascending or spreading, 2-7 dm. long, retrorsely pubescent : leaf-blades 2-4 

 cm. wide, reniform in outline, or those on the upper part of the stem more angular, the 

 main segments parted into linear lobes : petioles finely hirsute : pedicels glandular-hir- 

 sute : outer sepals ovate or oblong-ovate, 6-9 mm. long, glandular-ciliate, awn-tipped : 

 petals purple, about as long as the sepals : carpel -bodies 2-2.5 mm. long, sparingly pubes- 

 cent : style-column 10-15 mm. long, glandular-pubescent : seeds pitted. 



In waste places, established about the large cities of the United States and southern British Amer- 

 ica, in our range as far south as South Carolina. Summer and fall. 



4. Geranium Texanum (Trelease) Heller. Annual or biennial. Stem branched 

 at the base, the branches ascending or spreading, 1-3 dm. long, pubescent with appressed- 

 retrorse hairs : leaf -blades reniform or orbicular in outline, 2-3.5 cm. broad, 3-5-parted, 

 the segments toothed or incised : pedicels like the petioles, retrorsely pubescent : sepals 

 awn-tipped, the outer orbicular-ovate to suborbicular, 5-5.5 mm. long, pubescent with very 

 short hairs: petals pale purple, slightly longer than the sepals : carpel-bodies 2.5-3 mm. 

 long, sparingly villous : style-column 10-12 mm. long, appressed-pubescent : seeds pitted. 



On plains or prairies, southern Texas. Spring and summer. 



