Author Institution: Department of Botany and Plant Pathology, The Ohio State University, Columbus 1

Fisher, T. Richard

The Ohio Journal of Science

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A NEW SPECIES OF HELIOPSIS FROM MEXICO1T. RICHARD FISHERDepartment of Botany and Plant Pathology, The Ohio State University, Columbus 10Since the monograph of the genus Heliopsis (Compositae) was published(Fisher, 1957), a new species was collected in the State of Chiapas, Mexico, byDr. Robert Merrill King. Although it is known from only a single location itshould be recognized as a specific taxon because of its distinctive morphology.Heliopsis pulchra Fisher sp. nov.Herba Perennis 15.0 to 40.0 cm alta; folia ovato-deltoidea, scabra, 1.5 to 2.0 cm lata, 3.0to 5.0 cm longa, petioli 1.5 to 2.0 cm longi; capitula 1.0 to 1.5 cm lata, 0.5 cm alta; involucra1-seriata; radii 10 to 12, aurei; achenia quadrangularia, 2.5 to 3.0 mm longa, irregularitertuber culata.Erect or ascending perennial herb, 15 to 40 cm tall, branched nearly to base; stems somewhatwoody, 1.0 to 3.0 mm thick, sparingly pubescent below to strigose pubescent in lines above;leaves ovate to deltoid, 3.0 to 5.0 cm long, 1.5 to 2.0 cm wide below becoming progressivelysmaller above, strigose above and below becoming scabrous with age, densely strigose in axilsof young leaves, petioles slender, 1.5 to 2.0 cm long, strigose in lines, margin of leaves finelytoothed to nearly entire; heads (excluding rays) about 1.0 cm wide (in fruit); phyllaries in oneseries, appressed, strigose on both surfaces oblong-ovate, obtuse at apex; rays 0.8 to 1.0 cmlong, 0.4 to 0.5 cm wide, often 2- or 3-lobed at apex, bright orange-yellow when young, turninglight yellow with age; disk corollas yellowish, tube 3.0 to 4.0 mm long, glabrous to sparinglypubescent, lobes obtuse; pales lanceolate-oblong to spatulate, dull yellow at apex, 6.0 to 7.0mm long, 1.0 to 1.5 mm wide; ray achenes triangular in cross section, outer surface curved,2.5 to 3.0 mm long, surface irregularly tuberculate (fig. 1) very dark brown to black; disk achenesquadrangular in cross section, sharply so at apex, irregularly tuberculate, epappose or pappusrepresented by slight ridge (fig. 1).Type Collection: Chiapas, Mexico: oak forests along route 190, about 5 miles northwestof Comitan where it grows abundantly in sandy soil and open sun, 25 June 1960, Robert M.King 3049 (TEX; isotype deposited in The Ohio State University Herbarium).The only other species of Heliopsis reported to date in the State of Chiapas, Mexico isH. bupthalmoides (Jacq.) Dunal which appears to be the nearest relative of this newly describedtaxon. The distinguishing differences between the two taxa are as follows:H. bupthalmoides H. pulchra1. Achenes tan to light brown, rugose. 1. Achenes black, tuberculate.2. Leaves ovate to ovate-lanceolate, 2. Leaves deltoid to slightly ovate,approaching deltoid, pilose. becoming scabrous.3. Plants 30.0 to 75.0 cm tall. 3. Plants 15.0 to 40.0 cm tall.4. Rays yellow. 4. Rays orange-yellow.5. Phyllaries 2-seriate. 5. Phyllaries 1-seriate.LITERATURE CITEDFisher, T. R. 1957. Taxonomy of the genus Heliopsis Compositae. Ohio J. Sci. 57: 171-191.Publication 618—Department of Botany and Plant Pathology, The Ohio State University.THE OHIO JOURNAL OF SCIENCE 61(3): 178, May, 1961.No. 3 NEW SPECIES OF HELIOPSIS 179FIGURE 1. Detail drawings of portions of H. pulchra Fisher. A) Habit sketch of plant (Knatural size). B) Portion of stem bearing mature leaves, approximately naturalsize. C) Pubescence on upper leaf surface X30. D) Mature disk achene X50.

A New Species of Heliopsis from Mexico

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A New Species of Heliopsis from Mexico

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