106 KOSACEAE 



Plants diffusely spreading. 



Leaflets three. 4. P. leucocarpa. 



Leaflets five. 6. P. Canadensis. 



1. P. arguta Pursh. l°-3° high, glandular-pubescent : leaflets 7-11, 

 ovate, serrate : flowers densely oymose, yellovyish-white. — On a rooky 

 hill in Kansas City, just north of Roanoke Place. Very local. Jnne-July. 



2. P. Mouspeliensis L. l°-2° high, hairy : leaflets oblong-lanceolate, 

 serrate : flowers yellow, oymose : stamens 15-20. — Common throughout 

 in moist or dry soil. May-July. 



3. P. pentandra Engelm . Like the last : leaflets three, oblong-lance- 

 olate, the two lower parted nearly to the base : stamens 5-8. — Sandy 

 bottom along the Missouri River. May-July. 



4. P. leucocarpa Rydb. Spreading : leaflets three, oblong, serrate: 

 flowers loosely cymose, small : stamens abomt 10. — Sandy shores of the 

 Missouri River. May-July. 



5. P. paradoxa Nutt. Spreading : leaflets S-11, oblong-lanceolate, 

 crenate : flowers loosely oymose : stamens about 20. — Common on sandy 

 shores of the Missouri River. May-October. 



6. P. Canadensis L. Five Fingbe. Stems widely spreading by 

 runners : leaflets oblong-cuneate, serrate above : peduncles axillary^ 1- 

 flowered : stamens about 20. — Rather common in dry soil throughout. May. 



7. GEUM L. 



Erect herbs with pinnate leaves and cymose flowers. Calyx S-parted. 

 Petals 5. Stamens and carpels numerous. Styles long, persistent on 

 the fruit. 



Head of fruit stalked in the calyx. 1. G. vernum. 

 Head of fruit sessile. 



Peduncles appressed-pubesoent. 2. G. Canadense. 



Peduncles long-hirsute. 3. G. Virginianum. 



1. G. vemum (Raf.) T. & G. Spring Avbns. 1°-2° high, pubes- 

 cent : root-leaves orbicular, or 3-5-lobed, or pinnate with 3-7 obovate 

 leaflets : stem leaves pinnate : petals yellow : sepals reflexed : receptacles 

 smooth. — Locally common in low woods near Sheffield and Lake City. 

 May- June. 



2. G. Canadense Jacq. White Avens. Resembles the last in foli- 

 age, softly pubescent : calyx reflexed : petals whitish : styles pubescent 

 below: receptacle densely hairy. — Common in moist woods. June-August. 



3. G. Virginianum L. Rough Avens. Closely resembles No. 2, but 

 stouter and bristly-pubescent: receptacle nearly smooth.— Rare in low 

 woods near Lake City. May-July. 



8. AGRIMONIA L. Agrimony. 

 Erect perennials with pinnate leaves, the leaflets serrate and inter- 

 mixed with smaller leaflets. Flowers yellow, in spike-like racemes. 

 Calyx-tube oboonic and indurated in fruit, bristly above, completely 

 enclosing two achenes. Petals 5. Stamens 5-15. 



