386 CRITICAL NOTES ON SOME SPECIES OF CERASTIUM. 



specimens the flowering stems are 5-10 centim. high, with short 

 hiiear-hinceolate leaves, and terminating in few- flowered dichasia. 

 The specimens collected on Mt. Ararat at 3050 metres seem to be 

 identical with those of Kotschy (It. Cilicico-Kiird. 1859, n. 524) 

 from Bitlis, in the vilayet of Musch, referred to (J. gwiphalodes 

 (Boiss. Fl. Orient, i. 728), and with those of Aucher-Eloy from Mt. 

 Athos, in Eumelia (Herb. d'Orient, n. 624), which were referred to 

 C. (jrandifionim by Boissier, and to C. arvense by Grisebach. This 

 variety of C. alpinum seems, therefore, to have a wide range. 



29. C. ARCTicuM Lanfjje in Fl. Danica, t. 2963 ; et in Overs. Vid. 

 Selsk. Forh. 119 (1880). From an examination of authentic 

 specimens, I believe this to be an hybrid between two forms of 

 G. alpinum. At Am Binnein, in Perthshire, the plant is associated 

 as on Ben Lawers with forms of 0. nlpiniDii. In Greenland and 

 Lapland, and wherever else the plant has been found, one or other 

 of the forms of 0. alpinum occurs, and intermediate and connecting 

 forms are frequent. Mr. N. A. Svensson collected specimens in the 

 Lapmark district of Northern Sweden, which he considers hybrid 

 between C. alpinum var. (jhibrum and C. arcticwn. C. arcticum var. 

 Ednwnstonei is another obscure form from Unst, one of the Shet- 

 land islands. Mr. J. M. Norman records connecting forms from 

 the island of East Vagoen and from Finmark, in Arctic Norway; 

 though ni a letter I recently received from him he expresses un- 

 certainty as to the status of 0. arcticum. In his lucid notes on the 

 flora of Arctic Norway he writes : " non dubito, quin proles hybrida 

 sit, etsi una parentum, Cerastium Jatifolium, in tractu natali ejus 

 hactenus non inventa est, tamen in districtu vicino Ofoten pro- 

 veniens." The form has been found as far south as Caernarvon- 

 shire. 



30. C. ARENARiuM Teuore, Fl. Napolitana, iv. 232 (1830). I have 

 examined the authentic specimens in Gay's herbarium which were 

 sent to him by Tenore, who collected them at Castellamare, to the 

 south of Naples. The plant has been so shuttlecocked from one 

 species to another, that I have here described it from these speci- 

 mens as if they represented the type of a species, though I believe 

 it should be united with C. jjellucidum (1821). Whether the latter 

 be considered as a variety or as a species, it should certainly be 

 placed in the same small group with C. semidecandnun. 



Radix annua, fibrillosa. Caules erecti basi conferti, cum ramis 

 diffusis adscendentes, villoso-hirsuti, virescentes, glanduloso-viscosi 

 aliquando autem non viscosi, crassiores quam in C. semidecandro, 

 in dichasium laxum soluti. Folia basilaria spathulata pedolata, 

 superiora ovale-lanceolata vel late linearia. Dichasium multoties 

 dichotomum ; pedicelli inferiores calyce 2|-4-plo longiores (in 

 descriptione originali Tenore " piu corti" scripsit, i.e. paullum 

 breviores) ; flores micropetali ; bracteae late scariosse oblongo- 

 lineares acuminatae. Sepala lanceolata acuta, interiora paullo 

 angustiora. Petala emarginato-biloba calyce breviora, unguibus 

 glabris. Stamina 5 ; filamenta glabra. Capsula ovato-cylmdrica, 

 apice leviter incurvata, calyce duplo longior. Semina rulescentia, 



