150 EOSACEAE. 



Stems silky-strigillose : first flower at the first node of the 



stem. 2. P. ptnnila. 



Flowers in terminal cymes : stems erect or ascending : annuals 

 or biennials. 

 Leaflets 3 : upper part of the achene ribbed lengthwise. 3. P. monspeliensis. 

 Leaflets 5-7 : upper part of the achene smooth or reticulate. 4. P. sulphurea. 



1. P. canadensis L. Stem branched at the base, the branches decumbent or 

 prostrate, 3-6 dm. long (the larger form with more appressed pubescence and 

 larger leaflets is P. canadensis simplex) : leaflets 5 ; blades obovate to cuneate- 

 oblong, 2-4 cm. long: corolla 10-12 mm. wide, the petals about J longer than 

 the sepals. — Common, in dry flelds and on roadsides. Spr. and sum. 



2. P. pumila Poir. Stems at first erect and less than 1.5 dm. tall: leaflets 5; 

 blades obovate, about 2 cm. long: corollas 6-10 mm. wide, the petals but little 

 surpassing the sepals. — Common, in old fields and on rocky hillsides. — Spr. 

 and sum. 



3. P. monspeliensis L. Stems 3-11 dm. tall, hirsute (with fine pubescence and 

 objlong leaflet-blades in P. monspeliensis norvegica) : leaflets 3-5 ; blades 

 obovate, serrate : sepals oblong-lanceolate : petals obovate. — Common, in fields 

 and waste places, and on roadsides. — Spr. and sum. 



4. P. sulphurea Lam. Stems 4-7 dm. tall, finely pubescent and with some 

 longer hairs : leaflets mostly 5-7 ; blades coarsely toothed : sepals lanceolate : 

 petals obovate, longer than the sepals. — S. Not common, in fields. Nat. of 

 Eu. — Sum. 



10. WAIjDSTEINIA Willd. Acaulescent herbs. Leaf-blades lobed or 

 divided. Flowers in corymbose cymes. Petals yellow, rounded. Eeceptacle 

 minute. Carpels and achenes obovoid. 



1. W. fragarioides (Michx.) Tratt. Plants 0.5-3 dm. tall: leaf -blades 3- 

 foliolate; leaflets 2-4 cm. long, the blades cuneate to obovate, creuate-lobed or 

 incised : petals 8-10 mm. long, twice as long as the sepals : styles glabrous. — 

 N. Eare, in damp woods. — Sandstones and shales. — Spr. — Barben-straw- 



BERRY. 



11. STYLIPUS Eaf. Perennial herbs resembling Geum in habit: but 

 calyx not accompanied by a series of bractlets. Styles elongate and tapering, 

 bent near the apex. Head of carpels, or achenes, stipitate. 



1. S. vemus Eaf. Stem and branches often decumbent: blades of the lower 

 leaves both lobed and pinnate: sepals about 2 mm. long: petals shorter than 

 the sepals : heads of achenes 7-9 mm. in diameter : achene-body 3 mm. long. — 

 M. Eare, in thickets. Nat. of the Central States. — Spr. 



12. GEUM L. Herbs. Leaf -blades mostly 3-foliolate or pinnately divided. 

 Flowers solitary or in open cymes. Petals rounded or retuse. Eeceptacle 

 sessile. Carpels numerous: style jointed, elongate. Head of carpels, or achenes, 

 sessile. — Spr. and sum. — Avens. 



Corolla white, pale-yellow or cream-yellow ; petals spatulate, cuneate or oblong. 

 Corolla white : stipules entire or nearly so. 



Receptacle bristly : stem and branches glabrous or softly pilose. 



1. O. canadense. 

 Receptacle glabrous : stem and branches hirsute. 2. G. virginianum. 



Corolla pale-yellow or cream-yellow : stipules much cleft. 3. O. ffavum. 

 Corolla deep-yellow ; petals broadly obovate to suborbicular. 4. C?. strictum. 



1. G. canadense Jacq. Stems 3-9 dm. tall: blades of the lower leaves 3- 

 divided or pinnate: sepals about thrice as long as the bractlets: hypanthium 

 glabrous or finely canescent: heads of achenes 8-11 mm. long: achene-body 

 2.5-3 mm. long. — Common, in thickets and open woods. 



