Thouinidium. 613 



Embryo homotropus, notorrhizus, oleoso-carnosus amylique granula fovens, cotyledo- 

 nibus plerumque a marginibus compressis semi-ellipticis erectis basi curvatis, dorsali 

 paullo majore, radicula brevi, infera, centripeta, plica testae basilari excepta. — Arbores 

 parvae vel mediocres. Rami teretes, novelli ferrugineo-tomentelli, adultiores glabrati, 

 lenticelloso-punctati, extimi diametro 1— 4 mm. Folia alterna, petiolata, exstipulata, 

 abrupte pinnata, 2 — 8-juga, petiolo rhachique teretibus vel semiteretibus; foliola 

 sessilia vel breviter petiolulata, opposita vel superiora alterna, obovato-oblonga vel 

 lanceolata, integerrima vel serrulata, chartacea vel membranacea, penninervia, nervis 

 lateralibus tenuibus patulis densissime et tenuissime reticulato-venosa, venis (ultimis 

 exceptis) per totum diachyma transmissis, nunc glabra vel praesertim subtus secus 

 nervum medianum pilis unicellularibus glandulisque sat raris microscopicis clavatis 

 adspersa, nunc praesertim subtus pube molli induta ( Th. insigne), cellulis secretoriis 

 non nisi in 2 speciebus (Th. oblongum, decandrum) persita, diacbymate praeter crystalla 

 singula in speciebus 2 (Th. pinnatum et pulverulentum) concreta quoque fovente, 

 epidermide in speciebus 2 tantum (Th. insigne et oblongum) mucigera, in 1 specie 

 (Th. pinnatum) hypodermate tanninigero ad paginam superiorem suffulta. Paniculae 

 terminales vel sub rami innovatione laterales, pyramidales, multiflorae, rhachi plerum- 

 que tereti, secus ramos plerumque teretes stricte erecto-patentes subfastigiatos dichasia 

 vel pleiochasia brevia (cymulas autor.) gerentes; pedicelli bracteis bracteolisque minutis 

 suffulti, 2 — 3 mm longi; alabastra globosa. Flores parvi vel mediocres, diametro 

 5— 8mm, albi. Fructus conspicui, illos Acerum in mentem revocantes, ad axem 

 1— 2 cm alti, coccis 3 — 4,5 cm longis, infra alarum apicem 12 — 15 mm latis. 

 Species 6, aliae Antillarum, aliae Americae centralis, et Mexici incolae. 



Gonspectus specierum. 

 Sect. I. Coelothouinidium Radlk. in Fedde, Repert. XVII. 

 (1921) 363: Fructus loculi ampli, semine duplo majores; discus 

 completus; petala subsquamulata. Species unica (mexicana), 

 foliolis 1 — 2-jugis integerrimis subtus mollibus impunctatis, 

 epidermide sparsim valde mucigera 1. Th. insigne. 



Sect. II. Euthouinidium Radlk. in Sitzungsber. bayer. Akad. 

 VIII. (1878) 283, in Durand, Ind. gen. (1887) 73 et in Engl. u. 

 Prantl, Nat. Pflanzenfam. III. 5. (1895) 314: Fructus loculi 

 semen arcte amplectentes; discus completus (foliola 1 — 3-juga, 

 integerrima, glabra). 



A. Petala squama emarginata aucta, utrinque sericeo-tomen- 

 tosa; foliola impunctata. 



a. Foliola obovata, saepius emarginata, hypodermate in- 



structa (sp. domingensis) 2. Th. pinnatum. 



b. Foliola elliptico-lanceolata (sp. cubensi-domingensis) . 3. Th. pulverulentum. 



B. Petala squamulis 2 (lobulis inflexis) aucta, praeter basin 

 utrinque glabra; foliola oblonga, punctata, epidermide 



mucigera (sp. mexicana) 4. Th. oblongum. 



Sect. III. Loxothouinidium Radlk. 11. cc. : Fructus loculi semen 



arcte amplectentes; discus interruptus (rarissime completus); 



petala 4 (raro 5) subglabra, squama minuta bifida villosa aucta. 

 Species mexicana et centrali-americana, foliolis 2 — 8-jugis 

 anguste lanceolatis, serrulatis, glabris, punctatis 5. Th. decandrum. • 



Accedit species (sectionis III?) mihi non visa, mexicana, foliolis 

 3 — 8-jugis, serratis, petalis 4, disco crasso, fructu maturo in- 

 cognito, loculis fructus juvenilis longe alatis ....... 6. Th. riparium. 



