32 flora indioa. {RanUUCuUceCB . 



a. major, foliis orbicularibus inciso-crenatis, acheniis longioribus in 

 capitulum oblongum collectis. 



£. alpinus (Hook.); minor, foliis ellipticis vel oblongis apice triden- 

 tatis, acheniis latioribus brevioribus in capitulum globosum collectis. 



Hab. In Tibet occ. ubique, inter Iskardo, alt. 7000 ped.! et Hundes! 

 (a. rarior, in paludosis 10-12,000 ped.; £. vulgatissimus, usque "ad 

 17,000 ped. alt. adscendens) et in Sikkim interioris alpibus, alt. 11,500- 

 14,000 ped. \~{v. v.) 



Distrib. Sibiria! Persia! America bor. in planitie a Novo Eboraco 

 in montibus a Mexico usque ad mare arcticum! in Americse austr. tem- 

 peratse et tropicae alpibus ! 



Herbajparv* (ssepe pusilla), stolonifera, ad nodos radicans et foliosa. Folia forma 

 valde varia, orbicularia elliptica vel oblonga, regulariter inciso-crenata, vel apice tan- 

 tum triloba, basi rotundata vel cordata, \~\ poll, longa. Scapi folia requantes vel 

 longiores, 1-6- (vel rarissime 12-) unciales, 1-pauciflori, aphylli, vel ad rami ficat ion es 

 bracteas lineares iucisasve gerentes. Flores |— J-unciales, flavidi. Sepala 5, ovalia, 

 patentia vel reflexa, membranacea, subcolorata. Petala 5-8, anguste obovata. Ache- 

 nia numerosa, obovata, compressa, dorso gibbosa, stylo brevi uncinato vel recto apicu- 

 lata, utrinque longitudinaliter tricostata. 



This, though a very variable plant in form of leaf and in size, is well characterized 

 by the longitudinally ribbed fruit. It is extremely widely diffused, and as all the 

 forms have a wide extension, there can, we think, be no doubt, notwithstanding 

 slight differences in the shape of the leaves and fruit, that only one species exists. 



§ 2. Folia omnia secta, caulis radicans. (R. diffusus, DC, in*quo 

 caulis ad nodos radicans cum affinibus, in § 4 quserendus.) 



8. R. radicans (C. A. Meyer in Ledeb. PL Alt. ii. 316); pro- 

 stratus, radicans, foliis reniformibus 3-5-lobis, floribus oppositifoliis, 

 acheniis numerosis subglobosis. — Ledeb. Ic. Alt. t. 116, FLRoss. i. 34. 

 R. natans, C. A. Mey. in Led. Ic. Alt. t. 114, et Fl. Ross. i. 34. 



Hab. In Tibet occidentali alpirio: Ladak 14-16,000 ped., H. Stra- 

 cliey ; Hundes, Str. et Wint.! — (v. v.) 

 Distrib. Sibiria, Ledeb./ 



Herba prostrata, glabra, in paludosis radicans, et radices plurimas albas fibrillosas 

 emittens, interdum fluitans. Folia ad nodos in ramulo abbreviato axillari plura, re- 

 niformia, pollicaria, 3-5-loba vel 3-5-fida, lobis rotundatis vel crenatis. Flores parvi, 

 diametro -^-unciales, oppositifolii vel sub terrnin ales, longe pedicellati. Sepala reflexa. 

 Petala late obovata, fere rotundata, sepalis vix longiora. Achenia plurima, parva, in 

 capitulum fere -^-unciale globosum collecta, vix compressa, stylo brevissimo mucro- 

 nata. 



The two species distinguished by Meyer and Ledebour differ in nothing but the 

 degree of division of the leaves. 



9. R. hyperboreus (Bottb. Act. Hafn. x. 458. t. 4. f. 16); ptt- 

 sillus, stoloniferus vel erectus, foliis 3-5-fidis, floribus solitariis, acheniis 

 numerosis parvis subglobosis. — DC. Prod. i. 35 ; Ledeb. FL Ross. i. 35 ; 

 Torr. et Gray, Fl. N. Am. i. 20. E, pygmaeus, Wail. Fl. Lapp. 157. 

 t. 8./. 1 ; DC. Prod. i. 35 ; Ledeb. Fl. Ross. i. 36 ; Torrey et Gray, I c. 



Hab. In summis alpibus : Ladak, H. Strachey! Kanawer, Jacque- 

 montf et Sikkim, alt. 15-17,000 ped.!— (v. v.) 



