REVISION OF THE GENUS SANGUISORBA. 203 
Subgen. I. SANGUISORBA, Z.—Flores omnes hermaphroditi (rarius 
polygami, supremis mere femineis), aut omnes tetrandri, aut omnes 
dodecandri, plerumque monogyni. Stigma muricato-papillosum. Calycis 
tubus fructifer siccus, quadrangularis vel quadrialatus, levis. Vege- 
tatio in omnibus lateralis, surculis floriferis e foliorum radicalium axillis 
prodeuntibus. 
Sect. 1. EvsaNGUISOR2A, De Cesati, Iconogr. Pl. It. ii.—Stamina 4, carpidium 
1, calyx fructiferus quadrangularis vel anguste quadrialatus 
A. Florescentia adscendens (centripeta). 
l. S. Canadensis, L., cum varietate Sitchensi (latifolia), et (2) S. 
media, 
2. S. alpina, Bunge. 
B. Florescentia descendens (centrifuga). 
3. S. officinalis, L. (cujus varietates esse videntur: S. montana 
et serotina, Jordan, nec non S. auriculata, Scop., cui flores polygami 
adscribuntur). 
4. S. tenuifolia, Fisch., cum formis dibus non satis extricatis : 
S. carnea, Fisch. ; S. rubra, Schrank; S. angustifolia, Fisch.; S. longi- 
Jolia, Bertol. 
5. S. polygama, Nyland. (An a S. officinali satis distincta ?) 
Sect. 2. PTERACHENIUM, De Cesati, 1. c.—Stamina 6-15 (sæpissime 10-12) ; 
carpidia 1-2; calycis tubus latissime alatus ; florescentia e regione media 
adscendens simul et descenden 
6. S. dodecandra, eae 
Subgen. II. PorERIDIUM, Spach.—Flores omnes hermaphroditi, 
diandri vel tetrandri, monogyni. Stigma breviter penicillatum. Calycis 
tubus fructifer induratus, quadrialatus, reticulatim et transverse ru- 
gosus. Vegetatio terminalis. Florescentia adscendens. 
7. S. myriophylla (Rchb. Herb.), A. Br. et Bouché. 
“ Poterium myriophyllum, Gay, 309," Select. Sem. Hort. Acad. 
Dresdensis, 1846.  (* Gay " errore typographico pro Geyer.) “ Po- 
terium myriophyllum, Reichenb. (N. Am. Geyer) Hort. Dresd. 1846 ; 
Reichenb. pater in herb. filii. Poterium annum, Nutt. msp. iu Hooker, 
Flor. Bor.-Amer. i. (1140), p. 198. Sanguisorba annua, Nutt, msp. 
in Torr. et Gray, Flor. of North Am. i. 429; Hooker, London Journ. 
of Bot. vi. (1847) 219; Torrey in Marcy, Exploration of the Red 
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