132 W. W. Jones, Zexmeniae. 



shape and pubescence of its leaves, long and ciliated involucral scales, 

 and large more or less margined ray-achenes. 



2. Zexmenia gracilis W. W. Jones, 1. c. p. 154. 



Frutex ramis longis tenuissimis; folia ovata usque lanceolata, 5 — 10 cm 

 longa, 2 — 4 cm lata, basi acuminata usque rotundata, apice valde acuta 

 vel acuminata, serrata praeter partem apicalem, supra strigosa pilis basi 

 incrassatis, subtus parce breviterque strigosa; petioli 5—15 mm longi; 

 pedunculi 4 — 8 cm longi, tenues, plerumque in axillas superiores 3 — 4 

 superpositi, capituli 1 — 1,5 cm alti, involucrum 4 — 7 mm latum, cylindra- 

 ceum, 2 — 3-seriatum; bracteae exteriores manifesto brevissimae, plerum- 

 que reflexae, ciliatae; flores ligulati aurantiaco-lutei; achaenia ut in Z. 

 fruticosa Rose: achaenia disci biaristatae, aristae quam corpus longiores, 

 involucrum multo superantes; achaenia radii paulo marginata, aristae 2 

 dentiformes et 1 tenuis setiformis. 



Western Mexico. — Colima: Colima. Palmer no. 163, 1879 

 (type in herb. U. S. Nat. MusJ. 



3. Zexmenia ceanothifolia Sch. Bip. var. conferta (Gray in herb.) W. 

 W. Jones, 1. c. p. 155. — Syn.: Lipochaeta umbeUata var. conferta DC. 

 Prodr. V (1836), 610. 



Folia lanceolata usque elliptica, 1—2,5 cm lata, apice attenuata usque 

 subtruncata, supra subtusque appresso-pubescentia, subsessilia; pedunculi 

 pauci usque numerosi, plerumque brevissimi; involucrum sub- 3-seriatum; 

 bracteae acutae; flores ligulati ut videtur citrini. 



Mexico. — Morelos: Cuernasaca, Berlandier no. 1053 (type, frag- 

 ment in herb. Gray). Without exact locality, Gregg no. 1070. Tepic: 

 Acaponeta, Lamb no. 519. 



4. Zexmenia foliosa Rusby in herb, apud W. W. Jones, 1. c. p. 162. 

 Subherbacea, caules foliati; folia plerumque 1 — 2 dm longa, latitudine 



ca. dimidium longitudinis aequantia, ovata, apice acuminata, basi sub- 

 cordata vel paulo attenuata, serrata, supra strigosa, subtus scabrido-puberula; 

 petioli marginati, 1 — 4 cm longi; pedunculi 1—3 cm longi, tenues pubes- 

 centes plerumque terminales solitarii vel in cymam ternati; capituli 

 I— 2 cm alti, bracteis multis longis patentibus foliaceis suffulti, bracteae 

 involucrales caudato-attenuatae, ciliatae vel paulo hirsutae; flores radii 

 nulli; flores disci paleas superantes, antherae nigrae exsertae; achaenia 

 anguste alata, constricta, squamellis brevibus distinctis instructa; achaenia 

 marginalia triquetra, 3-aristata, interiora compressa, 2-aristata. 



South America. — Bolivia: Guanai-Tapuani, Bang no. 1340 (type). 



Dr. Rusby (Mem. Torr. Bot. Club VI, pt. 1. p. 63) mentions this plant 

 (without specific name or characterization) and expresses a doubt whether 

 it should be included in Zexmenia on account of the foliaceous bracts of 

 the involucre and the absence of rays. However, it is closely related in 

 achenial characters to Z. ivedelioides, and in general habit to several other 

 species of the genus. 



(Diagn. angl. transtulit in latin. J. Mildbraed.) 



