360 safford: myrmecophilous acacias 



Section 2. Dolichocephalae 



{Sphaerocephalae Schenck, in part) 



Flowers in spheroid or oblong heads having a thick peduncle and ovoid 

 or oblong receptacle; interfloral bracteoles with glabrous pedicels and 

 ovoid, obtuse, usually ciliate laminae. Leaflets usually with only the 

 midrib conspicuous beneath. Nectar glands of the petiole resembling 

 those of the Spadicigerae. 



6. Acacia sphaerocephala Schlecht. & Cham. Linnaea 5: 594. 1830; 

 not Acacia sphaerocephala Benth. Trans. Linn. Soc. London 30^ : 514. 1875. 



Type in the Berlin Herbarium, collected at Actopan, State of Veracruz, 

 Mexico, in March, 1820, by Schiede (no. 684), with flowers and leaves; 

 photograph and fragments of the type in U. S. National Herbarium. 



7. Acacia cornigera(L.) Willd. Sp.Pl. 4: 1080. 1806 (excl. synonyms)- 

 Type in the Liimaean Herbarium'' from a cultivated plant growing 



in the garden of George Clifford, between Haarlem and Leyden, Holland, 

 collected by Linnaeus (no. 4) and bearing his label, "Mimusa cornigera." 



8. Acacia veracruzensls Schenck, Repert. Nov. Sp. Fedde 12:362. 

 1913.— Bot. Jahrb. Engler 50: 477. 1914. 



Type in Herb. Mex. Schenck, collected on sand dunes south of the city 

 of Veracruz, Mexico, October, 1908, by H. Schenck (no. 916); fragments 

 of the type in the U. S. National Herbarium. 



GROUP IL GLOBULIFERAE 



(Sphaerocephalae Schenck, in part) 



Pericarp dehiscent, coriaceous or woody, more or less compressed, 

 sometimes very long and slender, opening by ventral and dorsal sutures. 

 Flowers in long-peduncled globose heads, with spheroid receptacle. 



Section 3. Ramulosae 



Flower heads borne in the axils of small subulate stipular spines on 

 special flowering branchlets. 



9. Acacia globulifera sp. nov. Flowers in small globose heads not 

 exceeding 5 mm. in diameter at anthesis, clustered in 2's or 3's on solitary 

 axillary branchlets 4 to 6 cm. long; peduncles in each cluster graduated in 

 length, the longest at anthesis about twice as long as the diameter of 

 the head; receptacle spheroid or broadly ovoid, not sharply constricted 



^The writer is indebted to Dr. Alfred Barton Rendle of the British Museum of 

 Natural History for a photograph of the type of Acacia cornigera (^L.) Willd. A 

 careful comparison of this with photographs and portions of the types of A. 

 spadicigera and A. sphaerocephala proves that Linnaeus's original plant is speci- 

 fically distinct from both. It resembles an Acacia collected on the shore north 

 of the city of Veracruz, January 24, 1906, by Dr. J. M. Greenman (no. 87), allied 

 to A. sphaerocephala Schlecht. and Cham., but differing from that species in its 

 extrafloral nectaries and in the shape of the flower heads. 



