| OCR Text |
Show CHAP. III. 92 GES NERIA PENDULINA. h . verage number was 1 t and t eu a 1 d d by pro uce the cross.e d ptha n su, mber I. n ten cleistogene capsu10 o6s 6 4 capsule · whilst e n 49.4 . or as 100 to . 4p ro. d upceer d by the ~elf-fertilised plants was ' ESNERIACEJE.-GESNERIA PENDULIN A. III. G 1 fl wer arc arranged on 1 ts of t le o h In Gcsneria the severa . pa~i ·italis,* and most or all of t e nearly the same plan as In g were raised from seed sent me ies are dichogamous. Plants '1 Seven flowers wore crossed ~e~ritz Miiller from South~:::' ~nd produced seven capsules 'th llen from a distinct p . ' f d Seven flowers on the WI po . 3·01 rams o see s. d th . containing bywetght tT ~ with their own pollen, ar: ~rr same plants were fer. I Ise tl the same weight of see s. seven capsules contained ~::~e/ on opposite side~ of four pots, Germinating seeds were p d to the tips of then leaves. and when fully grown measure TABLE XXVI. - I No. of Pot. CrossE!d Plants. Self-fertilised Plants. -~- - Inches. Inches. 39 I. 42~ 24~ 27 a I 1- 30 ~ II. 33 27 19 ~ - I 31~ III. 33~ \ 29~ 28~ - 29~ -- IV. 30% 36 26~ - - 233·13 j - Total in{)hes. 256•50 I - · ,_ · ht crossed plants IS 32 . 06 inches, The average height of the ei~ . . d lants . 29 ·14; or as 10 0 and that of the eight self-fertilise P to 90. * Dr. Ogle, 'Popular Science Revw· w' ' Jan . 1870, P· 51. CHAP. III. SAL VIA COCCINE A. 93 IV. LABIATJE.-SALVIA COCOINEA.* This species, unlike most of the others in the same genus, yields a good many seeds when insects are excluded. I gathered ninety-eight capsules produced by flowers spontaneously selffertilised under a net, and they contained on an average 1 · 45 seeds, whilst flowers artificially fertilised with their own pollen, in which case the stigma will have received plenty of pollen, yielded on an average 3 · 3 seeds, or more than twice as many. Twenty flowers were crossed with pollen from a distinct plant, and twenty-six were self-fertilised. There was no great difference in the proportional number of flowers which produced capsules by these two processes, or in the number of the contained seeds, or in the weight of an equal number of seeds. Seeds of both kinds were sown rather thickly on opposite sides of three pots. When the seedlings were about 3 inches in height, the crossed showed a slight advantage over the selffertilised. When two-thirds grown, the two tallest plants on each side of each pot were measured; the crossed averaged 16 · 37 inches, and the self-fertilised 11 · 75 in height; or as 100 to 71. When the plants wore fully grown and had done flowering, the two tallest plants on each side were again measured, with the results shown in the followino· table:- TABLE XXVII. No. of Pot. I Ccosscd Plants. I Inches. I. 32~ 20 24~ • Self-fertilised Plants. Inches. 25 ISS II.j-3~- --- _ ________ , ____ _ III. 29 ~ 28 -~ ;n~ 167 ·13 25 18 127·00 * The admirable mechanical adaptations in this genus for favouring or ensurino- cross-fertilisation, have been fully described by Sprengel, Hildebrand, Delpino, H. Muller, Ogle, and others, in their several works. |
