. The elements of structural botany [microform] : with special reference to the study of Canadian plants, to which is added a selection of examination papers. Plant anatomy; Botany; Botanique; Botanique. ELEMENTS OF 8TRLMURAI, HOTANY. 01. Fit'. 150. ated fioni cacli otlier ])y a ilnuhle null, and that the seeds wcjuld bo found ananged about tlio coutro or axis of tiio pistil; ni d this is tho actual htato of things in tho Tulii', Nvhoso i)istii is fornitd by tho union of three carpels. ^Vhcn the pistil ripens, tlu^ double walls sepa- rating tho cells s[)lit asuraler. To theso nepaiating walls
. The elements of structural botany [microform] : with special reference to the study of Canadian plants, to which is added a selection of examination papers. Plant anatomy; Botany; Botanique; Botanique. ELEMENTS OF 8TRLMURAI, HOTANY. 01. Fit'. 150. ated fioni cacli otlier ])y a ilnuhle null, and that the seeds wcjuld bo found ananged about tlio coutro or axis of tiio pistil; ni d this is tho actual htato of things in tho Tulii', Nvhoso i)istii is fornitd by tho union of three carpels. ^Vhcn the pistil ripens, tlu^ double walls sepa- rating tho cells s[)lit asuraler. To theso nepaiating walls tho name ilissrj/htunt or p'lrtifion is given. 110. But it often happens that though Kevoral car- pels unite to form a compound pistil, there is buL one cell m the ovary. This is because tho separate carp lary leaves Lave not been folded btforo uniting, . Vavo been joined edge to edge, or ^^;::— rather with tlieii" edges slightly '' ^^ turned inwards. lu these cases the seeds cannot, of course, bo in tho centre of the ovary, but will be found 071 the wa/h, at tho junction ot the carpels (Figs. 150, 151). In fcomo plants tho ovary lif^% is one-celled, and the seeds are arranged %^ round a column which ribes from tho bottom 1 of tho cell (Figs. 152, 153). This caso is I' i53. explained by tic early obliteration of the partitions, which must at first Lave met in the centre of the cell. 141. In all cases tlie line or projection to "svhich tl c seeds are attaclied is called the placenta^ and the term placental ion Las reference to tlie manner in wLicL tLc placentas are arranged. In tlie simple pistil tLe placeutation is marginal or sutuniL In tlie syncarpous pistil, if tLe dissepiments meet in tLe centre of the ovary, tLu: dividing it into stparate cells, tLe placenta- tion is ce?i<m^ or axile ; if tLo ovary i: one-celled -". bears the seeds on its walls, the placentation iapariotuK-. Please note that these images are extracted from scanned page images th
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectbotany, booksubjectpl
