Volume 81Number 41994Annalsof theMissouriBotanicalGardenREVISION OF HILLIA(RUBIACEAE)'MISSpOUR BOTANICALDFf1 5 -19QCharlotte M. Taylor2 GARDER LUMYABSTRACT Hillia Jacq. is a genus of 24 usually epiphytic species that are distinguished by their convolute corola aestivationand comose seeds. Based on corolla characters, five subgenera are recognized here subgenus Hillia (six specie),subgenus Andinae C. M. Taylor (one species), subgenus Tetrandrae C. M. Taylor (five specie), subgenu llustresC. M. Taylor (seven species), and subgenus Ravaia (Oersted) C. M. Taylor (five speces). Keys to ail species of thegenus are provided, and those of the first four subgenera are described and illustrated. Hillia Jacq. is a genus of 24 species of usuallyepipytic shrubs distributed widely in the moist andwet Neotropics. These species are easily separatedromn ail other Rubiaceae by their seeds with a tuftof "trichomes" 1-3 cm long attached at one end,and can usually also be recognized by a succulentepiphytic habit, caducous ligulate stipules that aremterpetiolarly connate, solitary flowers, and cylin-drieal woody capsules. The corollas may have oneof several combinations of color and form: whiteand salverform, green t yellow-green or red andfnnelform, or red and tubular to inflated. Species of Hillia can be confused with those ofCosmibuna Ruiz & Pav., which are succulentepiphytes with a similar geographic range, similarcapsules, and salverform white corollas similar tothose of some species of Hillia (Taylor, 1992).Cosmibuena can be distinguished by its glabrousseeds, interpetilarly and partially intrapetiolarlyconnate stipules, and usually three or more flowersper inflorescence. Steyermark (1974) also distin-guished Hilli by the lack of marginal wings onthe seeds; however, many seeds of Hillia have atleast a thin marginal wing, while the seeds of Cos-mibuena are variable in this regard. Thse generacan usually also be separated by their stigmas,which are bilobed, densely papilose, and held abovethe anthers in Cosmibuena, in contrast to subcap-S1 thank the curators of the following institutions, who kindiy made specimens available A, AAU, CAS, COL,RD C, CTES, CUVC, DUKE, F, G, GB HAC, HAJB, HUA, JBSD, MO, NY, P UCR, UPR, UPRRP, US,VA , and I IWIS. 1 also thank e Depar t f Biology and the Fond Institcional Para la Invetiac of theUnvesit of Puerto Rico-Recinto de Ro Piedras, the Manual to the Plants f Costa Rica project of the MiouritniCal Gardn, the National Science Foundation (BSR 87-00068), and the Dee Scholarship Fund of the FieldSof Natural Histry for support for travel. I am indebted to collagus who contributed through discuionsents notaby W. Burger, D. Lrenc, J. Dwyer. L Anderson, M. H. Grayum, W. Haber, B. HammelW-. t~evens, R. Thoas, D. J. Lodge, and E. Christensen. I thank R. E. Gereu Z. Mercado, T. Zanni, B.M" P.Hoch, P. B y, and J. Poly fr help with ny , icctae rer and fieldwrk. M Botaie arden, P.O. Bx 29, St. L s M oi 63 1 099, U.S.A. ANN. Mssoul BOT. GAr. 81: 571-609. 1994.la&
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