'lO-L POLYGAL^ AMEKiCAN^. 



Seniina nigra, j)iibesceiitia ; arillodii appendices semine tertia parte 

 breviores. 



Guatemala. Val de Fuego, 8300 feet, Salvin ; locis graminosis, 

 Llano de la Laguna de Ayarces, Bern., 695. Often confounded 

 with P. scoparia, H. B. K. ; but a smaller and less rigid plant ; and 

 distinguished also by its acuminate leaves and the great length of 

 the wing -sepals. 



The two next species, of isolated distribution, would almost seem 

 to form a subsection by themselves, and are doubtfully placed in 

 this section. 



33. P. insuJaris, nob. Glaberrima. Caulisbasilignosus, erectus, 

 subrigidus, ramosus, 1-2 pedalis. Folia sparsa vel rarius conferta, 

 sub-adx)ressa, linearia, lineari-obovata, vel cuneata, 4-5 lin. 

 longa, coriacea, enerva, acuta vel obtusa, glanduloso-punctata. 

 Eacemi terminales, breves, sat densi ; bracteaa hneari-ovatEe, 

 deciduie. Flores 2-lin. longi, pedicellis brevibus glabris gracilibus 

 suftulti. Sepala exteriora ovata, glabra, superius majus ; al^e 

 sepala exteriora duplo excedentes, obovat^, corolla longiores, 

 subacut^e. Carina pulchre cristata ; petala lateralia angusta. 

 Ovarium glabrum, ellipticum. Capsula alls persistentibus multo 

 brevior, emarginata. Semina obconica, sericea, arillodii appendices 

 breves. 



Galapagos Islands ; Anderson, 181 ; Cuming, 103 ; Chatham 

 Is., Darwin; Albemarle Is., Macrae; Charles Is., Edmonston, 

 Hooker. P. ohocata, Hook. f. in Linn. Trans, xx., 233 ; And., Veg. 

 Gal., 231 (non St. Hil.). Leaves very variable, but always narrow 

 and coriaceous. 



34. P. (jalapageia, Hook. f. in Linn. Trans, xx., 233 ; And., Veg. 

 Gal., 232. Glaberrima. Caulis erectus, infra lignosus, gracilis ; 

 parce ramosus, virgatus, 6-10 poll, longus. Folia sparsa, tenuia, 

 i-poll. longa, linearia vel obcuneata, acuminata. Bacemi spicse- 

 formes, elongati, 1-3 poll, longi ; bracteae deciduae. Flores 3 lin. 

 longi. Sepala exteriora subaequalia, ovata ; alee triplo longiores, 

 elliptic^e. Carinte crista conspicua. Capsula (immatura) obovata. 

 Semina obconica, sericea ; arillodium duabus appendicibus minutis 

 praeditum. 



Galapagos Islands. Charles and Albemarle Islands ; Chatham 

 Island, Anderson. Distinguished from P. imidaris by its more 

 slender habit, larger flowers, elongated racemes, and the leaves 

 being always thin. 



Andersson's P. r/t(itai)ieiisis, I.e. 232, must probably be identified 

 with P. insulaiu ; and his P. jjitbcnila, I.e. 232 (non A. Gray) with 

 P. </alaj)a(/eia. 



In this section must perhaps be included also two North 

 American species which have been greatly confounded with one 

 another, but which have been well distinguished by Gray (PI. 

 Wright, i., 38). 



P. alba, Nutt., Gen., ii., 87 ; D.C., Prodr., i., 330; Torr. and 

 Gr., i., 130 ; Hook., Lond. Journ. Bot., vi., 72, has thin leaves, a 

 dense raceme, the flowers nearly sessile and erect. It is P. bicolur 

 of IL B. K., v., 394, t. 507 ; P. scoparia, Benth., PI. Hartw., 30 (non 



