Box— Vol. I.] EASTWOOD— STUDIES FROM THE HERBARIUM. II3 



This covered large areas on the ridge. It is almost iden- 

 tical with Professor Greene's type. 



65. Malacothrix implicata, sp. nov. 



Stems woody, purplish, glabrous or slightly viscid, branched above : leaves 

 numerous and close together, irregularly bipinnatifid into numerous narrow, 

 linear divisions which form a tangle so that individual leaves cannot be sepa- 

 rated in the dried specimens ; length of entire leaf about 6 cm., with divisions 

 beginning at the base, varying in length from 4 mm. to 3 cm.: heads 2 cm. 

 in diameter, closely cymose at the ends of the branches on short peduncles ; 

 ligules white, unevenly toothed and lobed; tube pilose with upwardly spread- 

 ing hairs; akenes 2}i mm. long, four or five angled, with one or two ribs 

 between the angles, brown, minutely tuberculate, scar at base prominent, 

 apex with white denticulate border. The receptacle, as in M. saxatilis 

 becomes capitate, with the bracts of the involucre deflexed. 



" Queens's Dairy," sand and wind carved cliffs. 



It has been extremely puzzling to know what to do with 

 this. It might just as well be made a variety of M. 

 saxatilis. 



From an inspection of allied Malacothrix from the other 

 islands and the mainland it is found that all are more or 

 less alike, differing in leaves, habit of growth, size of heads, 

 and character of akenes. They are all evidently the off- 

 spring of a common parent and having been isolated, have 

 developed peculiarities of their own. They are excellent 

 examples of Darwinian species. This one from San Nico- 

 las is most similar to one collected by W. G. W. Harford 

 on San Miguel, but differs in having smaller heads and a 

 more compact habit. There are no seeds on the San 

 Miguel plant and we shall probably remain forever ignorant 

 of its fruit, since, according to Dr. Gustav Eisen, who 

 visited the island during the summer of 1897, the vegetation 

 has been entirely destroyed by goats and the island has 

 become a desolate waste of drifting sand. 



I have provisionally included the San Miguel plant as 

 well as specimens from Santa Rosa and Santa Cruz under 

 this name. The last two have the divisions of the leaves 

 broader and thicker, the inflorescence an open cymose 

 panicle, and the heads smaller. 



