366 PROCEEDINGS OF THE AMERICAN ACADEMY 



R. Shaftoanus, Oxygraphis Shaftoana, Aitch. & Hemsl. in Jour. 

 Linn. Soc. xix. 140, t. 3, of Afghanistan, is clearly a congener, with 

 simply ternatisect, instead of triternatisect leaves. 



§ 5. Ctrtorhyncha (Benth. &, Hook.), Gray, Proc. Acad. 1863, 

 56. Petals (yellow) bearing a prominent callosity instead of nec- 

 tariferous pit and scale: carpels 10 to 18, Tlialictrum-Yike, being 

 terete and prominently about 10-costate, subcoriaceous and somewhat 

 utricular, tipped with an injiexed style. 



R. Ndttallii, Gray, 1. c. Cyrtorhyncha ranunculina, Nutt. 



§ 6. Halodes. Like Euranuncuhis, but mature carpels thin- 

 walled and utricular, the sides nervose : scapose and flagelliferous. — 

 Here R. plantaginifolius, Murr. {R. sahuginosus, Pall.? DC, R. 

 Ruthenicus, Jacq.) of Siberia, and the very widely diffused 



R. Cymbalaria, Pursh. Greenland, N. and Central Asia, the 

 whole breadth of N. America, to extra-tropical S. America. 



§ 7. EuRANUNCULUS. Petals (with nectariferous pit and scale, 

 usually yellow) and sepals deciduous : akenes crustaceous or firm- 

 coriaceous, the sides nerveless, not transversely rugose. 

 * Petals white, 8 to 10 : sepals 3 or 4. 

 R. Pallasii, Schlecht. Alaskan Islands to Labrador fide E. Mar- 

 tens, but this needs confirmation. Lapland, Arctic E. Asia. 

 * * Petals in ours yellow, commonly 5, in a few species reduced to 3, 

 in others increased to 6 or 8, or even 10 to 16. 

 H— Amphibious aquatic, with submersed foliage of § Batracliium. 

 R. MULTIFIDUS, Pursh, with its var. terrestris, and various in- 

 termediate forms. No one seems to know anything of the earlier 

 homonym of Fcirskall, and so the present name seems by general 

 consent to hold for the American species. 



-1- -t- Terrestrial and arctic-alpine perennials (or the first species 

 rather amphibious and barely subalpine), creeping and fibrous-root- 

 ing, either from procumbent stems or from filiform rootstocks ; the 

 rounded leaves palmately 3-5-lobed or parted, but not divided nor 

 filiform-dissected: flowers small 

 ++ Leafy-stemmed and rooting at the nodes, short-styled, and akenes 

 in a globular head, 

 R. NATANS, C. A. Meyer. To this, rather than to R. multifdus, 

 should be referred R. radicans, C. A. Meyer, and R. Purshii of Torr. 

 in Ann. Lye. N. Y. ii. 1 62. 



R. HYPERBOREUS, Rottb. 



