rOLYGONACE^:. (lU( KWUKAT FAMILY.) 4 11 



to ohlong or sometimes lanceolate, f/rn^'.sA, cuneato or cordate at ba.He (2-5' 

 long) ; spike terminal, dense, ovale or oblorni (A- l' long) ; flowers bright rose- 

 color (H- 3" long) ; the 5 stamens and 2-cleft style exserted. — Widely disiril)- 

 uted and rather common. (Ku., Asia.) 



10. P. Muhlenbergii, Watson. Perennial, in mnddy or dry places, 

 decumbent or sul)crect, sea /)/ohs icith short apprrssed or fjkindulnr hdirs ; leaves 

 thinner, rather broad/ ij lanceolate, narroxdy acuminate (4-7' long) ; spikes more 

 c/on<jated (1 -3' long), often in pairs; flowers and fruit nearly as in the last, 

 (r. aniphibium, var. terrcstrc, 6'm^, Manual; not Leers.) — X. Kng. to l-la., 

 westward across the continent. 



* * Sheaths and bracts hristli/ ciliate or the sheaths Jhliareouslj margined. 

 -I- Sepals not punctate ; stijle 2-cleft; achene somewhat flattened . 



11. P. Hartwrightii, Cray. Perennial, very closely allied to n. 9, 

 growing usually in nun I, the ascending stems rooting at base and very leafy, 

 more or less rough-hairij, at least on the sheaths and bracts, the former ciliate 

 and often ivith abruptlij spreading fuliaceons borders; leaves rather narrow (2 - 7' 

 long), on very short petioles ; flowers and fruit as in n. 9. — X. Eng. and X. Y., 

 to Minn., Iowa, and far westward. When growing in water the floating leaves 

 are thicker and glabr<Kis. 



12. P. Careyi, Olney. Annual, erect, the stem ('3-5° high) and pedun- 

 cles qlandular-bristlg ; leaves narrowlg lanceolate, attenuate to both ends, rough- 

 isb ; sheaths ciliate or sometimes margined; spikes slender, loose and nodding; 

 flowers purplish; stamens mostlij 5. — Shady swamps, S. Maine and X. II. to 

 Peuu. and Ont. 



P. oriextAle, L. (Prince's Feather.) Tall branching annual, soft- 

 hairg ; leaves ovate or oblong, pointed, distinctly peti<jled ; sheaths ciliate or 

 itften icith an abrupt sj)reading border; flowers large, l)right rose-color, in d use 

 ci/lindrical nodding spikes; stamens 7. — Sparingly escaped from ganlena into 

 waste grounds. (Adv. from India.) 



P. PersrAri.v, L. (Lady's Tutmh.) Nearly smooth and glahroKs {\2- 

 18' high); sheaths more or less bristly -ciliate ; leaves lanceolate, i)ointe(l, 

 roughish, often marked with a (hirk triangular or lunar spot near the miiblle ; 

 spikes ovoid or nlilong, dinse, erect, on smooth (or at li'ast not glandular) jmliin- 

 t/^.s ; stamens mostly 6 ; stgles half 2-:W/rft ; achene gibbous-flattened or 

 sometimes triangular, smooth and shining. — Waste and damp places, very 

 common. (Xat. from Eu.) 

 -4- •*- Sepals conspicuousl !i dotted and leaves punctate (except n. 13), with acrid 



juice; style mostly ^-parted, and achene triangular ; sheaths bristle fringed. 



13. P. hydropiperoldes, Michx. (Mild "WATER-PEPrKK.) Peren- 

 nial, not acrid; stem smooth (1-3° high), branching; the narrow sheaths 

 hair 11 ; leaves narrowly lanceolate, sometimes oblong ; spikes erect, slender, 

 sometimes filiform, often interrupted at base (1-2^' long) ; flowers small, flesh- 

 color or nearly white ; sepals not dotted ; stamens 8 ; achene sharplg triangular, 

 smooth and shining. — Wet places and in shallow water; common, espeiially 

 sonthward. 



14. P. Hydropiper, E. (CoMAtoN Smaktwekd or Water-Pepim k.) 

 Annual, 1 -2^ bigh, smootli ; leaves narrowly to linear-lanceolate ; spikes nod- 

 dinq, usually short or interrujjted ; flowers mostly greenish; .stamens 6; style 

 2-3-]iarted; achene dull, minutely striate. — Moist or wet grounds; ap])a- 

 rently introduced ea.stward, but indigenous north and westward. (Eu.) 



