30 PROCEEDINGS OF THE AMERICAN ACADEMY. 



is irregular, a trait which, if it really were true, would place the genus 

 in the Mutisieae. Finally Addisonia is described and figured as having 

 corollas with campanulate throats. Under these circumstances, it is 

 by no means remarkable that the real affinity of these plants has 

 not been noticed until authentic specimens of each of them could be 

 studied in relation to the others. The combined genus may be treated 

 as follows : 



HELOGYNE Nutt. (Nomen ab 17X0?, ciavls, et yvvq, muUer, ob forma 

 styli ramorum incrassatorum.) — Capitula parvula homogama 6-12- 

 flora terminalia vel subcorymbosa vel spicato-racemosa ; involucro 

 subcylindrico vel anguste campanulato, squamis 2-4-seriatis imbrica- 

 tis, receptaculo parvo nudo planiusculo. CoroUae anguste tubulosae 

 vel etiam angustissime fusiformes nullo modo in fauces ullos distinc- 

 tos ampliatae externe glanduloso-puberulis vel pulverulis, limbi brevis- 

 sime 5-dentati dentibus suberectis vel leviter patentibus. Antherae 

 lineares inclusae apice obtuse appendiculatae basi integrae. Styli rami 

 valde exserti plus minusve patentes valde sed gradatim incrassati flavi 

 vel saepius nigrescentes. Achaenia 5-costata prismatica deorsum levi- 

 ter angustata. Pappi setae subaequales tenues achaeniis subaequilon- 

 gae vel superantes barbellatae vel subplumosae. — • Trans. Am. Phil. 

 Soc. n. s. vii. 449 (1841) ; Walp. Rep. vi. 107 (1846) ; Benth. et Hook, 

 f Gen. ii. 239 (1873) ; Hoffm. in Engl, et Prantl. Nat. Pflanzenf iv. 

 Ab. 5, 133 (1890). Bmchyandra Phil. Fl. Atac. 34, t. 4, f D (1860) ; 

 Benth. et Hook, f, 1. c. 244 (1873); Hoffm. 1. c. 138 (1890); Reiche, 

 Fl. de Chil. iii. 263 (1902). Leto Phil. Ann. Mus. Nac. Chil. sec. 2 

 (botanica), 33, t. 1, f. 3 (1891); Hoffm. 1. c. 334 (1893). Addisonia 

 Rusby, Bull. Torr. Bot. Club, xx. 432, t. 169 (1893). — Frutices ramo- 

 sissimi foliosi glanduloso-puberuli. Folia alterna parva Integra vel 

 dentata vel lobato-subpinnatifida sessilia. 



Species 4 regionis desiccatae Peruviae et Boliviae australis et rei 

 publicae Chilensis borealis incolae. 



Sect. I. EuHELOGYNE, scct. nov., involucri squamis subaequalibus ca. 

 2-seriatim imbricatis. — Helogyne Nutt. 1. c. Leto Phil. 1. c. — Species 

 unica. 



1. H. APALOiDEA Nutt., ramis arcuato-ascendentibus foliosis, inter- 

 nodiis brevibus ; foliis parvis 8-15 mm. longis cuneato-oblanceolatis 

 integerrimis vel saepius irregulariter pinnatim 2-3-lobatis vel supremis 

 solum apice 2-3-dentatis glanduloso-puberulis amaris ; capitulis 8-12- 

 floris paucis erectis corymbosis, pedicellis gracilibus erectis vel arcuato- 

 ascendentibus ; involucri squamis subaequalibus anguste ellipticis vel 



