^2 CXXXIV. POLYGONACE^ . [Eriogonece. 



Tribus I. Ekiogoxe.e. 



J 



1. Eriogronum, Mich. Fl. Bor. Amer. i. 246, *. 24. (Espinosa, Lag. Gen. et Sp. PL 

 N'ov, 14, ex char, fcrevi. )— Involucrnm campamilatnm turbinatiim v. cylindraceum, 5-8- 

 dentatum v. lobatum. Flores in involucro oo, v. rarissime casu solitarii, per aiitliesin 

 ex involucro exserti. Periantliium G~partitum v. alte 6-fidum, segmentis post anthesin 

 ssepe auctis ^equalibus v. exterioribus majoribus rarissime brevioribus. Stamina 0, basi 

 perianthii v. altius affixa, filamentis filiformibus basi s?epe pilosis. Ovarium 3-quetrum ; 

 styli 3, breviter v. longiuscule filiformes, apice capitato-stigmatosi. Nux perianthio 

 persistente obtecta, 3-quetra interdum 3-alata. Embryo nunc in medio albumine fere 

 rectus, nunc excentricus v. fere lateralis incurvus, radicula tunc accumbenti-ascendente 

 cotyledonibus longiore,— Herb?G suifruticesve ca^spitosi v. anmue tenuesque, lana densa 

 brevi subfloccosa v. tomento incano pmesertim ad basin caulis et in pagina inferiore folio- 

 rum rarius omnino deficiente. Folia ad basin caulis conferta subradicalia, v. in caule 

 infra mflorescentiam pauca, alterna, integerrima, petiole ima basi plus minus dilatata 

 amplexicaulia, ocrea v. obscura. Pedunculi v. rami fioriferi a collo scapiformes v. in 

 caule axillares terminalesque interdum apice involucrum unicum ferentes, stepissime 

 tamen in ramos 2-co semel v. repetite 2 -3-cliotomos v. umbellatos divisi. Bractete sub 

 inflorcscentire raniificationibus tot quot rami, basi ssepe connatae, nunc brevissima3 adpress^B 

 v. patentes, nunc in folia expans^e, nunc membranacefe stipuliformes et interdum folia 

 foventes intra bracteas sub involucro sessili oriunda. Umbella; v. generales v. partiales 

 interdum in capitula contracts. Involucra solitaria v. complura capitata, intra bracteas 

 2 sessilia v. pedicellata, in inflorescentia dichotoma alaria v. terminalia, v. ramo altero 

 dichotomise abortiente secus ramos paniculae unilateraliter dissitte. Bracteolre intra 

 involucrum inter pediceUos ssepe numerosas tenerrimaj v. setaceo3, interdum per- 

 paucse v. 0. 



Species notse fere 100, Americse borealfs imprimis occidentalis incola?, paucis usque ad Mexicum 

 extensis. Benth. in DC. Prod. xiv. 5. Torr. et Gray in Proc. Amcr. Acad. viii. 116. 8. Wats, in 

 Troc. Amer. Acad. xii. 254, xiv. 295, et Bot. Calif, ii. 16, incd. 



Genus post Prodromum numero specicmm valde accretum a Torrey et Gray 1. e. reformatum et in 

 series 14 divisum, imprimis ad habitum ct inflorescontiam. partim etiam ex nuce angulatav. 3-alata 

 T. ad cmbryonem axilem rectumque v. excentrieum et curvulum. S. Watson nuperius sectiones tres 

 primarias proposuit sat naturales, etsi prsecipue ad involucra et bracteas definita sint. 



1. Eueriogonum. Involucra turbinata, sEepius 2-linearia v. longiora (rarius minima), nee costata 

 nee augulata, 4-8-dentata v. lobata. Bractese foliaceae 2, 5 v. oo, rarius subternse. Species plcrseque 

 perennes. Nuti. in Journ. Acad. Pkilad. vii. t. 8,/. 2. Hook. Fl. Bor. Amer. t. 175 ad 177 rt in 

 Kew Journ. Bot, v, t. 10. Benth. in Trans. Linn. Soc. xvii. t. 18, /. 2. A Gray, Bot. Amer. Expl 

 Kvped. ii. t. 14 b. Torr. Bot. Sitgr. Exjpcd. t. 8, 11, 12; Bot. Whipple Expcd. t. 19. 



Stenoqoxum, mitt, in Jonrn. Acad. Pkilad. ser. 2, i. 170, est E. sahuginosum, Hook., species 

 humilis ramosissima, ad Eueriogomm relata, etsi flores ex involucro minimo vix exserentur. 



2. Ganysma. Involucra campanulata v. breviter turbinata. nee costata nee angulata, dentibus 

 5 rotundatis ereetis, in paniculis repetite 2-3-chotomis pedunculata. Bracte^ parva, ternatse, non 

 foliatae, saepius triangulares rigidseque. Flores basi non attenuati. Species plersque anaufe.— 

 Benth. in Trans. Linn. Soc. xvii. t. 18,/. 1. S. Wats. Bot. 40 Parall. t. 33. 



3, Oregonium, Involucra cylindracco-turbinata, 5-6-nervia, ssepius costata v. angulata, breviter 

 dentata, capitata f>iRciculata v. secus ramos virgatos paniculae sparsa, semper erecta, 1-3 I'in. longa. 

 Bractege ternatae, basi connate, ssepius broves rigidaeque. Flores basi non attenuati. Species 

 plereeque perennes. -i?t'Wi;A. Bot. Sulph. t. 22. A. Gray, Bot. Amer. Expl. Expcd. ii. ^. 14 a. Bur. 

 Bot. WiUianism Exped. t. 15 ad 17. Torr. Bot. Sitgr. Exped. t. 9, 10. 



EucYCLA, Nutt. in Journ. Acad. Pkilad. ser, % i. 166, est E. ovalifolium, Nutt. in Journ Acad. 

 Philad. vii. t. 7 ad t. 8, f. I, species a creteris parum distincta pcriantliii segmentis utriusque seriei 

 magis disparibus. 



2. Ozytheca, Nidt. in Journ. Acad. Philad. ser. 2 i. 160. (Brisegnoa, Eemy vn C. Gay, 

 Fl Chil V. 291.)— Involucrum turbinato-campanulatum, tubo brevi, lobis 4 spinuloso- 



