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Show 364 PLANrrs STERILE WITHOUT INSECT-AID. CIIAP. X. Verba.scum pluiJm'ceum (Scrophulariacero).-Quito sterile }8cc my ac-v . Q 't t .1 count of sell'- • n~grum.- Ul 8 S en B • • • • . 'tcrileplantH, Campanula carpathica (Lobeliacere).-Quite sterile. Lobelia ramosa (J.Jobeliacoro).-Quite sterile. L.fulgens.-This plant is never visited in my garden by bees, and is quite sterile; but in a nursery-garden at a few miles' , distance I saw hun1ble-boes visiting the flowers, and they produced some capsnles. Isotoma (a white-flowered var.) (Lobeliacem).-Five plants left unprotected in my greenhouse produced twenty-four fine capsules, containing altogether 1~ · 2 grains weight of seed, and thirteen other very poor capsules, which wore rejected. Five plants protected from insects, but otherwise exposed. to the same conditions as ~he above plants, produced sixteen fine capsules, and twenty other very poo1· n,nd rejected ones. 'l'he sixteen fine cn,psulos contained seeds by weight in such proportion that twenty-four would have yielded 4·D6 grains. So that the unprotected plants produced nearly thrice as many seeds by weight as the protected pln,nts. Leschenaultia formos rt (Goodeniaccro).-Quite sterile. My experiments on this plant., showing the necessity of im;ect aid, are given in the ' G n,rdeners' Uhronicle,' 1871, p. 1166. Senecio cru,entus (Compositro).-Quitc sterile : see my n,ccount of self-sterile plants. Reterocentron mexican'll,m (Malastonll1Coro).-Quite sterile; but this species and the following members of the group produce plenty of seed when artificin,lly self-fertilised. Rhex~·a glandulosa (Melastornacero) .- Sot spontaneously only two or three capsules. Centradenia jlor'ibundu (1\feJn,stomacero).-During some years produced spontaneously two or threo capsules, sometimes none. Pleromr1, (unnamed species from Kew) (1\ielastomacem).-During some years produced spontaneously two or three capsules, sometimes none. Monochretum ensiferum (Melastomacom ).-During some years produced spontaneously two or three cap ·ules, · sometimes none. Ifed ych £ u m ( unnn,med species) (:Marn,n tacero ).-Almost self-sterile without aid. Orchidere.-An immense proportion of · the species sterile, if insects are excluded. CHAP. X. PIJANTS FERTILE ·wiTHOUT IN SECT-AID. 365 List of Plants. which when protected /', either quite Fertile or yield m .. th J;om Insects are ' ' o;e an rwlj th A? b of Seeds produced by unprotected Pla n t s. . e U1n er Passiflora gracilis (Passiflorace=) -P d h (. <N • ro ucos man f · t t ese contain fewer seeds than frujt f . y rui s, but Brassica oze,·acea (Cruciferro) - p a's rom Intorcrossed flowers. h · ro uces many 1 t ese generally not so rich in seed capsu es, but plants. as those on unc<'vered 1/aphanus sativus (Cruciferm).-Half of a 1 . . was covered by a net and ar~o brancbmg plant capsules as the other a~cl un;~~e:t:d thiCkly covered with the capsules on tho latter co t . d half; but twenty of d . n ame on an av . 3 5 sec s, whilst twenty of the rot t cL erage . 1. t35 seeds, that is, only a lfttle e~~re capsules contained only !his plant might perhaps have be than half the .numher. m the former list. on more properly Included lberis 'urnbelluta (Cruciferm ).-Hjo·hJy fertil 1. amara.-Highly fertile. 5 e. Reseda odorata and Zutea (Resedacem) ~C . . . . p1etely self-fertile. · ertain IndivJduals com- Eurya~eferox (Nymphroacero).-ProfessorCas ar . t this plant is highly self-fertil 1 · . P Y 1 ll orms me that remarks in the paper boforee :~er~ Insects are ex?luded. He well as those of the Victoria regia) e~r~~' that ~1S plants (as at a time; n,nd thn,t as this s ec. . uce on y one flower introduced in 1809 't - p 1es Is an annual, and was last fift . '.1 must have been self-fertili~ed for the his I y-six ge~eratwns; but Dr. Hooker assures me that to Kewc~wledge lt has been repeatedly introduced and that at d e same plant both of the Earyale and of 'the y· t . pro uce several flowers at 1he same t· Ic onn, Nymphrea (Nym l ) true. p p 1roacero .-Some species, as I am informed b ex:~:~~:~~ Caspary, are quite self-fertile when insects ar~ Adonis restivalis (R 1 ) fessor H H ff anuncu ace~ .-Produces, according to Pro-when pr~tecotedmafnn c: Spectiesfre:tge,' p. 11), plenty of seeds p rom msec s. I anunculus acr . (R d . ts anunculacero).-Produces plenty of d un er a net.. . see s Pup~~e; so;mifel'um. (Papaveraccro).-Thirty capsules from unere , plants yie~dcd 15. G grains weight of seed and tbirt capsules from covered-up plants, growing in the' same beJ J |
