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Show 142 PELARGONIUM ZONALE. CHAP. v. . CilAPTER V. GERANIACElE, LEGUMINOSJE, ON AGRACE.lE, ETC. 1 cross between p lants propagated .b . y Lcu tti·n gs Pelargonium zonae, a . -Limnanthes douglasn- upmus does no good-Tropreolum mlmus lt'tflorus and vulgaris-Lathyrus ·1 Phaseo us mu p· lutcus and pi osus- t . lly intercross in England- Isum odoratus, varieties of, neverl n~ utr~cr·oss but a cross between them sativum, van.e tI' es of ' rare y In er ar' ius wonderful effects of ' a highly benc:ficial-:-S~~ro~hamnuls. stc~~ne flowers of- Summary on cross-Onom.s m mutlssim.a , c1 e is oo- Bartonia aurca- I:> a 'f~ . SllOia · Chrkm e egn.ns L t the Legumm· osre-etro' se.l mum-Sc'a 1 ' ~a atropurpurea- ac uca )lOo f gracilis-Apmm. p eculum-Lobelia ramosa., advan~ag~s . o . ~ sativa-Speculana sp . L b r f 1 ens-N emophila msigms, cross during two generatwns-B o e Ja ~c~nalis-Nolana prostrata. great advantages of a cross- orugo o XIII. GERANIAOE.l:E.-PELAUGONIU1\'l ZONALE. * l rule is strongly proterandrous, and THIS plant, as a genera '.c t'l' ation by the aid of insects. d ted for cross-ler I IS 'l' d is therefore a ap ·l t variety were self-ferti Ise ' Some flowers on a common sdc ar .et h pollen from anoth(~r p1 a n t.' and other flowers were crosse w~h I remembered that these but no sooner had I done ds~ a~ings from tho same stock, Plants had been propagate t~ ctu of the same individual. f. t in a s nc sense and were there or.e par s ( , I resolved to save the seeds, Nevertheless, having ~ade the crodss , lanted on the opposite which, after germinatmg on san ' were p * Mr. J. Denny, a great I:aiser of new varieties of p~largon~um ~~ after ~:>tating that this species .Is roterandrous, adds (' 'rh~ :Flonst ~nd Pomologist,' Jan .. 1872, p. 11) u there are some vanet1es, e~pec. ially those with petuls of a pmk colour, or which possess a. w~akly constitution, whore the pistil .expands as soon as or even beto~·e the pollen-bag bursti:i, and m which al~o the pistil is freque.ntl.~ short so when 1· t ex pandbs Itt hJeS r..muthered as it were V'l~ieties bursting anthers; th~c . L being are groat 8eeders, eac Pllf 1 fel tilised by its ow I~ ~ol en. an would l. liS•L anc~ Chn. ,s, tmWe e nsl1 ave example of tbls ~uct. , f va- hero an m. t ei· estm. O' case o b ·t' t fuuc- Jiul>ility in an unpOl LtD tioual point. CHAP. v. PELARGONIUM ZONALE. 143 sides of three pots. In one pot the quasi-crossed plant was very · soon and ever afterwards taller and finer than the self-fertilised. In the two other pots the seedlings on both sides were for a time exactly equal; but when the self-fertilised plants were about 10 inches in height, they surpassed their antagonists by a little, and ever afterwards showed a more decided and increasing advantage; so that the self-fertilised plants, taken altogether, were somewhat superior to the quasi-crossed plants. In this case, as in that of the Origanum, if individuals which have been asexually propagated from the same stock, and which have been long subjected to the same conditions, are crossed, no advantage whatever is gained. Several flowers on another plant of the same variety were fertilised with pollen from the younger :flowers on the same plant, so as to avoid using the old and long-shed pollen from the same flower, as I thought that this latter might be less efficient than fresh pollen. Other flowers on the same plant were crossed with fresh pollen from a plant which, although closely similar, was known to have arisen as a distinct seedling. The self-fertilised seeds germinated rather before the others; but as soon as I got equal pairs they were planted on the opposite sides of four pots. TABLE XLIX. Pelargoniwn zonale. No. of Pot. Crossed Plants. Self-fertilised Plants. Inche . Inrhes. I. 22 ~ 25~ 19~ 1 2~ II. 15 19 y - 12~ 22~ III. 30~ 19 4 18g 7~ IV. 38 91 g -- Total in inches. 156•50 116.38 When the two lots of seedlings were between 4 and 5 inches in height they were equal, excepting in Pot IV., in which the crossed plant was much the tallest. \Vhen between 11 and 14 inches in height, they. were measm·ed to the tips of their uppermo t |