1 6*70 Vol. 43, pp. 163-166 September 26, 1930 PROCEED I N GS ^ — ^ OF THE //' ^^'■■■J-C ~5l>S. BIOLOGICAL SOCIETY OF WASHINCfjfrS'N TWO NEW ASTERACEAE FROM MEXICO COLLECTED BY GEORGES WORONOW. BY S. F. BLAZE. ^ >''i ?7m yy The identification of about 300 specimens of Asteraceae collected in Mexico and northern South America by Mr. Georges Woronow of the Botanic Garden of Leningrad and his assistants has brought to light two new species of the tribe Verbesininae which are described here. About a third of the specimens collected are represented by duplicates in the United States National Herbarium. Haplocalymma woronowii Blake, sp. nov. Very slender annual, simple below the inflorescence, thinly pilose; leaves remote, opposite in about 6-10 pairs, alternate in the inflorescence, the larger lanceolate, about 1.5 cm. long, acuminate, obtuse at base, serrate, 3-nerved, short-petioled, hirsute-pilose with subappressed antrorse hairs on both sides, densely so beneath; heads tiny, 11 mm. wide when expanded, several or rather numerous in a narrow and very open panicle, the filiform pedicels 1-4 cm. long; involucre 1-seriate, 2 mm. high, the phyllaries 5, lanceolate, acuminate, erectish-pilose; achenes glabrous, epappose, 1.1 mm. long. Erect, 25-40 cm. high, the hairs toward base of plant mostly spreading, the others mostly appressed or erectish, with obscurely enlarged bases; petioles 1-2 mm. long, hirsute-pilose; blades of principal leaves 7-18 mm. long, 2-7 mm. wide, thin, serrate above the entire base with 3-4 pairs of low sharp teeth, above dull green and antrorse-pilose, the hairs with small tuberculate bases, beneath griseously antrorse-pilose or substrigose, the hairs along the veins longer and stiffer; uppermost leaves alternate, narrowly lanceolate, 1.5 cm. long or less; panicle 3-14-headed, the divergent to erectish alternate branches bearing 1 to 4 scattered heads; pedicels naked, erect-pilose or substrigose; disk campanulate, in flower 3 mm. high, 2.5-3 mm. thick, in fruit 4 mm. high and thick; phyllaries about 0.7 mm. wide, subherbaceous, with 3 green nerves; rays 5, yellow, neutral, the ovary rudiment 1 mm. long, pilose above, the tube pilose, 0.4 mm. 27— Pboc. Biol. Soc. Wash., Vol. 43, 1930. (163)
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