A NEW HINTONIA (RUBIACEAE) FROM COSTA RICA Donald R. Simpson Field Nuseum of Natural History The genus Hintonia (tribe Condamineae) when proposed by Bullock (1935) contained four species and one variety distributed through Mexico from the southern parts of Sonora and Chichuahua to Yucatan and into the highlands of Guatemala. No new taxa have been added until the present, and although many new collections have accumulated since Bullock's publication, they have not appre-ciably extended the distribution range of the genus. The new Costa Rican species proposed below represents a major extension of that range. HINTONIA PULCHRA D. Simp. sp. nov. Arbor, 15 m. alta; ramulis glabris, leviter complanatis, ad nodos tumidis. Folium ellipticum vel anguste oblongum, apice basique longe attentuata, 7-12 mm. longo petiolo incluso 16.5-18 cm. longum, membranaceum vel chartaceum, glabrum; nervis secondariis utroque 6-8; stipulis peristentibus, brevissime subtriangularibus, cuspidatis, 2 mm. longa cuspide 4 mm. longis. Flores ad quoque nodum bini (i.e. opposita et singulares in quo-que axilla foliorum prodientes) ; sed duorum plerumque unus abor-tivus est; pedicellis ca. 17 mm. longis, ebracteatis, glabris; receptaculo glabro; lobis calycis quinque, anguste linearibus vel filiformibus, glabris, 27-30 rran. longis; corolla tubiformi, alba, ca. 27 cm. longa, ad basim ca. 6 mm. lata, versus apicem expansa usque 11 cm. ad partem latissimam; staminibus quinque, inclusis, antheris linearibus, 5-6 cm. longis, ca. 0.7 mm. latis; stylo stamen aequans, indiviso, stif^ate indiviso, unilaterali, ca. 11 mm. longo. Capsula ca. 3.5 cm. longa, diametro 1.5 cm., oblonga, base acuta, apice rotundato obtuso, glabra, longitudi-naliter 5-nervata et 5-costata; pedicello 2.2 cm. longo; lobis sepalorum persistentibus, 3.4 cm. longis, 1.5-2 mm. latis. Semena horizontaliter affixis, exalatis, clypeatus, diametro ca. 6 mm., 1.5-2.5 mm. crassa; testa granulariter indurata. Tree 15 m. tall. Leaves elliptic to narrowly oblong 16.5-18 cm. long, membranous to chartaceous. Flower buds two at a node (i.e. borne singly in each leaf axil), but seemingly one of the two aborting; pedicel ca. 17. mm. long, bractless; receptacle gla-brous; calyx lobes 5, narrowly linear or filiform, glabrous, 27-30 mm. long, corolla white, trumpet-shaped, ca. 27 cm. long, ca. 6 mm. wide below, 11 cm. wide at apex; stamens 5, included, anthers linear, 5-6 cm. long, ca. 0.7 mm. wide; style equaling the stamens, undivided; stigmatic surface ca. 3.5 cm. long by 1.5 cm. in dia-meter, oblong, base acute, apex rounded obtuse, glabrous longitud-inally 5-nerved and 5-ribbed, the ribs and nerves alternating, 277
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