ALPINE VEGETATION ON BEN-Y-GLOE, PERTHSHIRE 227 



ferrugineo-fui-furaceo ; staminibus omnino inclusis ; ovario dense 

 appresse griseo-pubescente biloculari. 



Mexico : shaded places on rocks at crossing of the river near 

 Tocotepeque, Jvily, Hartweg ! Hb. Kew. 



Remarkable for the creeping habit, thin leaves with densely 

 packed and conspicuous cystoliths, rounded corolla-lobes, and 

 included anthers. 



L. acuminatissima Wernham, sp. nov. Frutex, /o//is perga- 

 maceis lanceolatis utrinque angustatis acutis ad ca. 3 x 1"2 cm. 

 supra subnitentibus necnon glabrescentibus subtus pubescentibus, 

 brevissime petiolatis, stipulis brevibus acutissimis rigide subu- 

 lato-triangularibus. Floribus in axillis solitariis ; calycis lobis 

 subulato-linearibus ca. 4-7 mm. longis ; corolla, tubo ad 7-8 cm. 

 longo extus dense appresse sericeo, lobis 2-6 x 1 cm. ellipticis 

 caudato-acuminatis acutissimis. 



Barclay ! in Hb. Kew. 



The label bears the names "Gardenia mitis. Tobago Jasmine " ; 

 the exact locality is thus, unfortunately, doubtful. The new 

 species is allied to L. rivalis, but it is readily distinguishable 

 therefrom by the lengthy acumination of the corolla-lobes and the 

 much shorter calyx-lobes. 



Explanation of Plate 533. — Neosahicea LehmannWWernh&m. — 1. Portion 

 of flowering-shoot, natural size. 2. Single flower, x 4. 3. Flower in longi- 

 tudinal section, x 4. ^^ 



ALPINE VEGETATION ON BEN-Y-GLOE, PERTHSHIRE. 

 By Albert Wilson, F.L.S., and J. A. Wheldon, F.L.S. 



In the copious literature devoted in recent times to the 

 subject of plant geography, the constituents of the chief plant 

 associations of Great Britain have been well discussed, and the 

 subject has reached a further stage in its evolution, viz. the 

 investigation of the inter-relation of the various units included in 

 each group, and the causes which determine the presence or 

 absence of certain of them. This necessitates a careful biological 

 study of each species, and an inquiry into its means of adaptation 

 to the ecological conditions of the habitat. 



Although this advanced stage has been rapidly reached in the 

 case of the higher plants, owing to wide floristic knowledge 

 gleaned by generations of enthusiastic "field botanists," our 

 information on the grouping of associations dominated by 

 cryptogams is still incomplete, and the literature somewhat 

 scanty. In the various associations dominated by spermopbytes, 

 their cryptogamic associates have not been fully worked out, and 

 only the more conspicuous ones are mentioned in lists of 

 characteristic species, frequently, indeed, the generic name alone 

 being deemed sufficient, e. g. Bryum, Sjjhagmini, Polytrichum, 

 Cladonia, &c. Yet these genera contain species insisting on very 

 varied climatic and edaphic conditions, and as a rule it will be 



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