28 PROCEEDINGS OF THE AMERICAN ACADEMY. 



place as the later monotypic genus BracJujandra Phil., and there can 

 be no doubt that these two plants are congeneric. They are both 

 small-leaved glandular-pubescent xerophytic shrubs, with closely sim- 

 ilar achenes and pappus, and both possess the peculiar narrowly tubu- 

 lar corollas with exceedingly short teeth and no expanded throat. The 

 only difference between them which could possibly be regarded as of 

 generic importance is that the involucre in Helogijne is about 2-seriate 

 and of subequal bracts, while in Brachyandra it is about 3-seriate, the 

 outer bracts being decidedly shorter. In view of the close correspond- 

 ence in floral structure, achenes, leaf- arrangement, etc., this difference 

 in the involucre, which finds frequent parallels within the limits of 

 several other genera of the Compositae, seems by no means sufficient 

 to warrant keeping these two genera separate. The later name 

 proposed by Philippi must of course give way to the earlier one of 

 Nuttall. 



Leto Phil, is a third obscure Chilian xerophytic monotype of this 

 affinity. Its generic relationship to Brachyandra was shrewdly sur- 

 mised by Dr. 0. Hoffmann (see Engl. & Prantl. Nat. Pflanzen. iv. 

 Ab. 5, 334), notwithstanding a misleading statement in the original 

 description to the effect that the corollas were irregular, which is not 

 the case. More recently Reiche, Fl. de Chil. iii. 263 (1902), has for- 

 mally transferred the single species to Brachyandra. While at Berlin, 

 the writer had an opportunity to examine an authentic specimen of 

 this plant {Leto tenuif alius Phil., Brachyandra teniu/oUa Reiche), and 

 failed to find even specific distinctions between it and the type of Htdo- 

 gyne ajxdoidea preserved at the British Museum. It is true that the 

 specimen of Leto at Berlin shows some leaves much more deeply lobed 

 than any on the specimen of Helogyne at the British Museum, but the 

 latter consists only of a tip of a flowering branch on which the leaves, 

 3-toothed at the apex, correspond well with the uppermost leaves in the 

 Berlin plant. 



Still a fourth South American xerophytic monotype clearly belongs 

 to the same group, namely, Addisonia Rusby, Bull. Torr. Bot. Club, 

 XX. 432, t. 159 (1893). Like the three preceding, it is an erect viscid 

 much-branched shrub with small narrow alternate glandular leaves, 

 few-flowered heads, narrow subcylindric involucre, and disk fi-ee from 

 pales. In common with them it has 5 -angled achenes, slightly nar- 

 rowed toward the base, and crowned with numerous purple-tinged bar- 

 bellate setae. What is still more significant, it shares with them the 

 peculiar very narrowly tubular corollas destitute of any distinct throat 

 and provided with the same very short suberect teeth, of the same yel- 

 lowish white color and exhibiting the same tendency to external gran- 



