AcjENA. ROSACE /E. 4>0 



site the calyx-segments: filaments often dilated upwards. Carpels l-'2 : 

 style filifonu : stigma penicilliform or fimbriate. Achenium dry, iiKliidcd 

 in the indurated 4-\vinged calyx-tid)e. Seed suspended. Perennial, rarely 

 annual herbs, with une(|ually piimale loaves, and foliaceous persistent sti- 

 pules: leaflets jiefiolulate, serrate or ])innalifid, often stipellale. Flowers 

 in very dense ovate or cylindrical spikes. 



/' 1. .S. Canadensis (Linn.): perennial, glabrous; spikes elliptical when 

 young, cyUndrical and often much elongated in fruit ; stamens much longer 

 than^lie ealyx ; filaments flattened and dilated upwards; leaflets ovate or 

 oblong, serrate, obtuse, cordate, usually slipellafe ; carpel solitary. — S. 

 Canadensis and S. media, Linn, f^' authors. 



a. leaflets lanceolate, oblong, or oblong-ovate ; spikes white. — S. Cana- 

 densis, Michx.! fl. 1. x>- 100 »• Torr. ! Ji. 1. p. 176,- DC! prodr. 2. p. 

 594 ; Hook. ! fl. Bor.-Am. 1. p. 198. Piinpinella maxima Canadensis, 

 Cornuti, Canad. t. 174. 



/3. leaflets ovate; spikes reddish or purple, at least when young. — S. 

 media, DC! I. c. ; Hook. I. c. S. Canadensis, Cham. &f Schlecht. in 

 Limuea, 2. /;. 32 ; Bongard, vcg. Sitcha, I. c. p. 133. S. Canadensis /?. 

 latifolia. Hook. I. c. 



Wet meadows and borders of swamps, Newfoundland! Unalaschka, 

 Sitcha, &c. to the mountains of Georgia. West to Oregon ! fi. Oregon ! <te 

 N. W. Coast. Aug.-Oct. — Stem 1-4 feet high. Achenium .solitary. Calyx 

 3-bracteolate. — Burnet- Saxifrage. 



-7-2. S. annua (Nutt. ! mss.) : annual, glabrous; stem branching; leaflets 

 4-6-pairs, oval, deeply peetinate-pinnatifid ; the segments linear and very 

 narrow ; heads elliptical ; bracteoles 3, large and scarious ; filaments short, 

 not dilated. — Poterium annuum, Nutt. ! mss. in Hook.! fl. Bor.-Am. 1. p. 

 198. 



Plamsof Red River, Arkansas, abundant in denuded situations, Nuttall ! 

 Dr. Leavenworth ! and on rocks and moist places. Grand Ra])ids of the 

 Oregon to the Wahlamet, Douglas! i\"M/ta//.'— May-.Tuly.— Stem 10-20 

 inches high, slender, leafy. Leaflets cleft nearly to the midrib ; the seg- 

 ments obtuse or rather acute. Stii)ules resembling the leaflets. Heads at 

 length oblong. Flowers all perfect, brownish-green. Lobes of the calyx 

 broadly ovate, scarious, thickened at the base. Stamens 4, at length ex- 

 serted. — Mr. Nuttall distinguishes the Oregon plant, under the name of S. 

 occidentalis, on account of its more simple stems and more acute segments 

 of the leaves; but our specimens from Dr. Leavenworth seem wholly 

 similar. It is truly a Sanguisorba, although the habit is somewhat pe- 

 culiar. 



^' Poterium Sanguisorba, Linn. {Burnet, of the gardens) is said by Hooker to 

 grow near Lake Huron, on the authority of a specimen from Dr. Todd. We 

 suspect, however, that it is not a native, but has escaped from a garden. 



13. ACiENA. Linn. ; Vahl, enum. 1. p. 273. 



Calyx with 2-3 scaly bracteoles at the ba.se ; the tube oblong, constricted 

 at the throat, armed with glochidiate bristles ; the limb .3-5-parted. Petals 

 none. Stamens 3-5, inserted on the throat of the calj^x. Ovaries 1, or 

 rarelv 2 : stvle temiinal : stigma cristate or multifid. Aclienium enclosed 



