. A monograph of the North American species of the genus Polygonum [microform]. Botany; Dicotyledons; Botanique; Dicotyledones. I* [ ll 171 MKNUtll.'S I'littM Tin: IIKI'A liTMKNT UK IKdANV dl' (_'n|,r MIIIA s|iccics iirc iinl >ilual('i| In tlic cciilrc of tlic (â (ill;ilrr;il Imiiilli's. ns is u>iially lln' |iar('iilly to tlif torlion nl' llic twiiiiiiu' stem. The xylcni is hkhc nv less cxIciiriNr iml weak, |>(irti(iiis ol' it a|i|M''iniifc liUr wiKMl-parciirliyiiia liiaii lii<(' ti'uc wondy liln'es. Tlii' liiii'cs arc lari:'!'. |n--Jn </ in
. A monograph of the North American species of the genus Polygonum [microform]. Botany; Dicotyledons; Botanique; Dicotyledones. I* [ ll 171 MKNUtll.'S I'littM Tin: IIKI'A liTMKNT UK IKdANV dl' (_'n|,r MIIIA s|iccics iirc iinl >ilual('i| In tlic cciilrc of tlic (â (ill;ilrr;il Imiiilli's. ns is u>iially lln' |iar('iilly to tlif torlion nl' llic twiiiiiiu' stem. The xylcni is hkhc nv less cxIciiriNr iml weak, |>(irti(iiis ol' it a|i|M''iniifc liUr wiKMl-parciirliyiiia liiaii lii<(' ti'uc wondy liln'es. Tlii' liiii'cs arc lari:'!'. |n--Jn </ in (iianu'ti'r ami 2n(l-';)()// in Iniutii: lin'S('|)la arc cither traiis- \crsc or ()i)iic|iic, and \vc liiid iin ical ta|pl)liin,L;'. w ilh tiie Innn' axes I'aihai. 'I'lie larger tracheae an' not |ilentil'nl, and nmsl of theincxi>l in the ends of the imndlcs w liicii penetrate the pith as sliarp weil^es. llnwever, we lind all tile varieties represente marked with Imrdcr-pits. Weak amiulai' vessels exist near the pith, and their markiiiu^ are nfteii Ncry I'aiiit. The diameter dl'tlie tradieitles and \'essels \aries I'rnni Jl)-,")(( (/ in extreme easi's. Alter passing a row of lar^c (111) u â¢' 7<l-l 'Jl' n) pareiieliyniatoiis cells, the pith con- sists of cyliiidric or [irisinatic cells which measure as liitili as Idil /t , SUBGENUS ECHINOCAULON. I' AUii' Plants with weak stems aii over snrroinidinii' olijects hy means of recurved prickles. We Iind here (piite a characteristic anatomical strnctnre. The epidermis is donMe. averajiinj:' alimit .")() u. 'i'lie periiilematic cylinder is not Well developed and measures from oO-VO //. The |)lei'ome derivatives are stroiij:', ' with the exception of the pith, from "Ji)()-.'!.")(i i/. and each pai't is well de\eloped. 'I'his is the only instance where 1 have fonnd a doniile ejiidermis; the inner layei' of cells is somewhat laru'er than the outer, the dillerence often an
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbotany, bookyear1895
