428 ROSACEAE 



19. CHAMAERHODOS Bunge. 



^ Perennial or biennial herbs, with taproots, 2-4 times ternately divided 

 leaves, and small cymose flowers. Hypanthium cup-shaped, small. Petals and 

 sepals 5; bractlets wanting. Petals obovate or cuneate, somewhat clawed, 

 btamens 5, opposite the petals; filaments subulate, short, persistent; anthers 

 didymous, opemng by a slit. Pistils 5-10, or more; styles basal, filiform. Seed 

 msertecl near the base of the style, ascending and nearly orthotropous. 



1. C. Nuttallii Pickering. Plant 1-3 dm. high, erect, branching and leafy, 

 birsute and glandular; basal leaves numerous and rosulate, 2-4-ternately divided 

 mto linea,r or oblong divisions; inflorescence many-flowered; hypanthium 2-3 

 mm m diameter, hispid; sepals narrowly lanceolate, equalling or somewhat 

 ^lorter tiian the white obovate-cuneate petals. C. erecta Hook., not Bunge. 

 Plams: Sask.—S.D.— Colo.— Alaska. Plain— Mont. Jl-Au. 



20. SANGITISORBA L. Burnet. 



Leafy perennial herbs, with thick rootstocks. Leaves odd-pinnate, with 

 adnate stipu es and toothed leaflets. Flowers perfect or some of them pistillate, 

 m aense spikes. HjTaanthmm urn-shaped, contracted at the- mouth, angled, 

 and usually winged. Sepals 4, petaloid, deciduous, very concave. Petals none, 

 fetaraens m ours 4, opposite to the sepals. Pistils soHtary; styles terminal; 

 stigmas muncate-papillose ; ovule solitary, suspended. Achenes dry, enclosed 

 in the indurate 4-angled smooth hypanthium. 



T,«tJ'+?" f^^c^e'^sis C. A. Meyer. Stem leafy, 2-12 dm. high; leaves odd-pin- 

 s±.^±L^L^^'^^All:2Vleaflets; leaflets 2-7 cm. long. 1.5-5%Ai. wide, coarsely 



■Wash. SubmonL 



POTERIDIUM 



With ?dn n I'J't:'?!?^^ ^'''!?^^ ?y bienniaLs, with taproots. Leaves odd-pinnate, 

 feet i^Hpn P It '''"^ Pectinately pinnatifid leaflets. Flowers greenish, per- 

 moulh 4-w,WH «"^ ,'Pi^^'- Hypanthium urn-shaped, contracted at the 

 ™ onnositr n^^n ,1^"^^ *' f^^""' ""''^^ white-scarious margins. Stamens 2 or 

 terSl stkrTic K^'^ /"rf ' *'''^ '^?^^^; filaments short. Pistils solitarv; styles 

 bX 4'wfnl^ • S™'^'^^- 0^'^les solitary, suspended. Achenes eAclosed 

 m tne 4-^\ mged, mdurate, dry hji^anthium. 



leaves rfXmif''HV®-^^''!"-\ ^Z^^" ^tem branched, leafv. 2-10 dm. high; 

 El 2 pTi "^^-J'T^*.^', ^^^^«*^ °f the lower leaves 11-1.5, obovate, the 

 oS SDVos^;wrfP''''Kf ''^^^^' iP'",''?^'^^ i^t« ^15 narrowly linear acute divis- 

 rs mSi thS senl *''?^''S''^"'' ^-^2.5 cm., or in fr.iit even 3-4 cm. long, 

 stamens 2 onno.Ttrtt''^^^' ^^'^^te-margined, green in the middle, 2 mm. long; 

 wfth narrow^^wl S "^^^^^^^Pf ^^ J fruiting hypanthium lance-ovoid, 4-anglea, 

 Tt S %iS J^'' ''*f ""H*^ °^ the faces. Poterium annuum Hook., 

 Ida.-Cdif. SS flf^ntahs Nutt. Moist places: Wash.-Mont.- 



r & 



22. AGRIMONU L. Agrimony. 



inte^SStttt'tSkrl^ffn^f %I^:^"^^- ^^d-pinnate, with smaller leaflets 

 Hypanthium herT,i«r,w;„% u . blowers in narrow racemes, regular, perfect. 

 thiThenrin f^St usLlv^'f'n^"''' ^«"ft"^.ted at the throat Ld enclosing 

 hooked bSlS si™l,T f^ 10-grooyed longitudinallv. above with a ring o! 

 shaped beak on the f n,1+ P f^'^^f'^ '"^^^ ^^ ^^^s connivent, forming a nipple- 



h sienaer. i-istiis 2, styles termmal; stigmas 2-lobed; ovules suspended. 



^I'SSe'STpsl^^^u^^ed ii I^Sf "' ^"^^^«^' ^^« »°-«'- bristles reflexed; sepals 



Fruiting hypanthium with 24^erie^ of hri<.ti^ *i, , . 1- ^- Qryposepala. 



spreading; sepals acute Dnstles, the latter erect, ascending or merely 



2. A. striata. 



