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Asteraceae): Additions to the Genus Acilepis from Southern Asia

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Asteraceae): Additions to the Genus Acilepis from Southern Asia PROCEEDINGS OF THE BIOLOGICAL SOCIETY OF WASHINGTON 122(2):131–145. 2009. Studies on the Paleotropical Vernonieae (Asteraceae): additions to the genus Acilepis from southern Asia Harold Robinson* and John J. Skvarla (HR) Department of Botany, MRC-166, National Museum of Natural History, P.O. Box 37012, Smithsonian Institution, Washington, D.C. 20013-7012, U.S.A., e-mail: [email protected]; (JJS) Department of Botany and Microbiology, and Oklahoma Biological Survey, University of Oklahoma, Norman, Oklahoma 73019-6131, U.S.A., e-mail: [email protected] Abstract.—Thirty-three species are recognized in the genus Acilepis with new combinations provided for A. attenuata, A. chiangdaoensis, A. divergens, A. doichangensis, A. fysonii, A. gardneri, A. heynei, A. kingii, A. lobbii, A. namnaoensis, A. nayarii, A. nemoralis, A. ngaoensis, A. ornata, A. peguensis, A. peninsularis, A. principis, A. pseudosutepensis, A. setigera, A. sutepensis, A. thwaitesii, A. tonkinensis,andA. virgata. Acilepis belcheri is described as new. The rhizomiform structure of the pollen muri is discussed and compared with other Vernonieae in Old World Erlangeinae and in New World Lepidaploinae with similar muri. This study continues a series of papers ceous species in Asia under the name by the senior author aimed at delimiting Vernonia were insufficiently known at monophyletic genera within the tribe that time to determine their proper Vernonieae (Asteraceae), broadly sum- placement with regard to Acilepis, includ- marized by Robinson (1999a, 1999b, ing Vernonia attenuata DC. and V. 2007). The principal result has been the divergens (Roxb.) Edgew. These two disintegration of the extremely broad and species, widespread in southern Asia from aphyletic concept of the genus Vernonia India to China, were reviewed but left Schreb. The revisions are nearly complete unassigned by Robinson (1999b). The for the Western Hemisphere where the present study was initiated to place these true genus Vernonia occurs but are two species and thereby complete a incomplete for many taxa in the Eastern proper reassignment of all the species Hemisphere where no species of Vernonia that previously had been placed in the sensu stricto occur. genus Vernonia in China. In the process, In the first effort to resolve paleotropi- many additional species have been ob- cal members of the tribe (Robinson served from Burma, India, Sri Lanka, and 1999b), the genus Acilepis D. Don was Thailand and are formally transferred resurrected from synonymy under Verno- here to Acilepis, and a new species is nia, with ten recognized species. Notable described as well. Still other more poorly characteristics include the herbaceous known species from Burma, the former habit, the simple hairs of the stems, the Indochina, and India undoubtedly belong separated heads, unequal deeply separat- to the genus but await more complete ed cells of the setulae of the achenes, the floristic surveys of those areas. almost totally deciduous pappus, and the This study has made extensive use of triporate pollen. Many additional herba- the treatments of the tribe Vernonieae in India (Clarke 1876, Hooker 1881, Uniyal * Corresponding author. 1995), the Flora of China treatment by 132 PROCEEDINGS OF THE BIOLOGICAL SOCIETY OF WASHINGTON Fig. 1. Scanning electron micrographs of Acilepis pollen. A, B. A. attentuata, A. Henry 11692 (US). A, Whole grain with distinct pore. B, Rhizomiform structure of easily detached muri. Grains in A and B were acetolyzed. C, D. A. chiangdaoensis, M. Tagawa et al. T4038 (KYO). C, Unacetolyzed grain with caps showing positions of pores (p). D, Enlargement of 1C showing columellae and unperforated tectum. Chen (1985), and the treatments of [Figs. 1A, B, 2A–C, F: Erdtman (1960)], Koyama (2004, 2005) for Thailand. An followed by staining with osmium-thio- expanded concept of the genus Acilepis is carbohydrazide solutions and sputter presented here that includes most if not coating with gold/palladium (Robinson all of both groups treated by Koyama & Skvarla 2006, 2007; Robinson et al. (2004, 2005), as well as the Asian species 2008), or rehydrated in water or alcohol previously known as Vernonia attenuata directly from herbarium sheets and sim- and V. divergens. ilarly sputter coated (Figs. 1C, D, 2D, E). Observations were made with a JEOL 880 Materials and Methods (Samuel Roberts Microscopy Laboratory at the University of Oklahoma), LEICA Specimens examined are from the U. S. 440, and AMRAY 1810 (United States National Herbarium in Washington, National Museum of Natural History in D.C. Examination of all characters with Washington) scanning electron micro- a light microscope involved use of scopes (SEM), all equipped with lantha- Hoyer’s Solution (Anderson 1954). Pollen num hexaboride (LaB6) electron sources. grains were either treated with acetolysis Light microscope observations were made VOLUME 122, NUMBER 2 133 Fig. 2. Scanning electron micrographs of Acilepis pollen. A, A. dendigulensis, C. J. Saldanha 15785 (KYO). B, C, A. divergens, C. J. Saldanha 12357 (US). D–F. A. saligna, A. Henry 12714 (US). Figs. A–C, F show acetolyzed pollen; Figs. D, E show unacetolyzed pollen that preserves caps in positions of pores (p). 134 PROCEEDINGS OF THE BIOLOGICAL SOCIETY OF WASHINGTON with a Wild light microscope using 403 evident microperforations. Below the mar- and oil immersion optics. gins, the close-set columellae seem to equal the number of spines (Fig. 1D). The sides Discussion below the margin usually have a loose curtain of tectum deposits reaching to near The group of species placed here in the base (Fig. 2B). The lowest level of the Acilepis possesses triporate pollen and muri under the columellae has a horizontal acicular sweeping hairs of the style connector parallel to the muri margins. branches, both characters that are con- This basal connector resembles the struc- sistent with the large Old World subtribe ture in American Vernonieae termed Erlangeinae (Robinson 1999b). The de- rhizomiform by Robinson (1999b), where tails of the triporate echinolophate pollen connection to the foot layer seems weak or are the most distinctive feature in Acilepis lacking and muri can strip loose from the (Figs. 1A–D, 2A–F). The pollen is nota- core of the pollen grain as a unit (Fig. 1B). ble for possessing comparatively few A similar condition is observed in the lacunae (25–30). The limited number of American genera of the subtribe Lepida- lacunae results in a less irregular arrange- ploinae, Echinocoryne H. Rob. (Robinson ment of lacunae at the poles than in many 1987), Chrysolaena H. Rob. (Robinson other Old World genera with triporate 1988), and Lepidaploa (Cass.) Cass. (Rob- pollen. Nevertheless, as observed under inson 1990, 1999b). the light microscope, sometimes there The rhizomiform muri of Acilepis are may be a single polar lacuna and at other grossly similar to those of the American times three lacunae meeting at or near the Lepidaploinae, differing in many details pole, sometimes in the same grain. In such as the closeness of the columellae and polar views of grains, the lacunae over the the lack of microperforations in the pores are not perfectly aligned with the tectum. Many examples of muri partially pores (Figs. 1C, 2D, E). The irregularity separated from the foot layer can be seen of the lacunar arrangement extends into in Old World Erlangeinae. A spectacular the intercolpi, where lacunae are stag- and possibly closely related example is gered relative to each other, and a third Phyllocephalum of Asia and Indonesia lacuna or set of lacunae is sometimes (figured in Kirkman 1981; Robinson & interposed. The latter intercolpar region Marticorena 1986, Figs. 205–208). SEM has been examined with SEM, using studies by the present authors over the last unacetolyzed grains in which the caps 20 years show that Cyanthillium Blume over the pores are still present to mark also has muri that are not connected to the those lacunae (Figs. 1C, 2D, E). Acilepis foot layer between the baculae at the resembles other paleotropical Vernonieae intersections of the muri. The phenome- with triporate pollen in its irregular non, which needs further study, is thus far lacunae and differs from the tricolporate known only from the Vernonieae in the lophate pollen types that are common in Lepidaploinae of the New World and the the subtribe Linziinae of the Old World Erlangeinae of the Old World. and in many subtribes in the New World. The secondary veins of the leaf provide The triporate condition is found in the a somewhat helpful, though not complete, New World Vernonieae only in the distinguishing feature of Acilepis.The specialized Acilepidopsis Group and the veins are generally ascending, usually subtribe Pacouriinae. departing from the midvein at less than Details of the pollen muri are particu- 45u angles. With some exceptions, they larly notable. The margins of the muri ascend at least as much as basal margins have close-set short spines, and have no of the leaf. Vernonieae that have basal VOLUME 122, NUMBER 2 135 secondary veins strongly directed toward groups that Koyama (2004, 2005) referred the lower leaf margins do not belong to to as Vernonia Sect. Xipholepis in Thai- the genus. land (Koyama 2004), and Sect. Lepida- In comparisons with genera in the ploa Subsect. Paniculatae (Koyama 2005) subtribe Erlangiinae, the simple hairs of seem to be based largely on the involucral the stems, leaves, and inflorescence of bracts that prove to be so unreliable at the Acilepis are unlike the T-shaped form seen generic level. The Sect. Xipholepis treat- in genera such as Cyanthillium Blume, ment of Koyama (2004) contains species Hilliardiella H. Rob. and Orbivestis H. of the most typical element of Acilepis, Rob. Of these three genera, the latter two whereas the group treated as Sect. Lepi- differ by their non-lophate pollen, and daploa Subsect. Paniculata (Koyama Cyanthillium differs by its annual or 2005) contains V. attenuata and V.
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