of the Galapagos Archipelago. 257 



Legwminosce. — Generally firm testa, exalbuminous seeds, and great power of some to retain 



vitality. 

 RubiacecB. — The densely corneous albumen of many may afford a sufficient protection to the 



seed. 

 UmbellifercB, — Helosciadium laciniatum is one of the few species enjoying a wide range, for 



which I can oflFer no explanation. 

 Composite. — Exalbuminous seed. Pappus oiBaccharis and adhesive pubescence oiSieyes- 



beckia orienialis. 

 Lobeliacea and Scrophularina. — Very minute seeds of Scoparia dulcis and Lobelia Xa/a- 



pensis. 

 Rhizophora, Avicennia and Sceevola. — These all have a predilection for salt water, and con- 

 stitutional power in the embryo of resisting its destructive effects. Scavola has a hard 



putamen and scanty carnose albumen ; the other species are exalbuminous. 

 Apocynem. — Vallesia I believe to be a salt-marsh or sea-side plant ; it has a scanty albumen. 

 Convolvulacem. — These have a scanty mucilaginous albumen. Two of them, Iponuea maritima 



and Calystegia Soldanella, are sea-side species, with particularly wide ranges. 

 Solanece. — Small seeds and adhesive glands of Nicotiana glutinosa ; indurated osseous testa 



of Dictyocalyx, Solanum and Lycopersicum, 

 Verbenacece. — Exalbuminous embryo and osseous endocarp oi pierodendron and Lantana. 

 Labiata, Cordiacem and Boraginets. — Nucumentaceous pericarps and very scanty albumen. 



Cordia and Boraginem are exalbuminous, 

 Acanthacece. — Exalbuminous hooked seeds. 

 Plantagineee. — Very dense corneous albumen. 



PlumbaginecR and Plantagineee. — Viscid glands on calyx, and hooked prickles of some Pisonia. 

 Euphorbiacece and Urticece. — Non- peculiar species of these may have been introduced through 



the agency of man into Charles Island. 

 Hypoxtdeae and Commelinece offer no apparent facilities for the extraordinary range of the 



two species that represent these orders. 

 Cyperacete. — These have some facilities for adhesion to foreign substances, and the firm 



nature of the pericarp, further covered by the coalescing scales of the perianth, are 



protections. 

 Gramineae. — The ciliated glumes of Poa ciliaris and the awns of Setaria Rottleri are the 



only very evident aids to migration which I can adduce. The resistance of the seed to 



the action of salt water must be very slight indeed. 

 Cryptogamia. — The excessive minuteness of the sporules in this great class, together with 



the sporadic appearance of these where they are most minute, and the sudden deve- 

 lopment of others in suitable situations, leave little doubt that their diffusion by the 



winds is a never-ceasing though invisible operation. 



