Summary
Hierochloe quebrada, Anthoxanthinae, Aveneae, Poaceae, of steep, tropicalpine granitic ravines in northern Peru is described as new; plants had formerly been referred to H. juncifolia but differ from that southern South American species especially in a shorter lemma with long white ascending marginal hairs, and the lemma of the middle floret with a compound awn inserted mid-point, with a long, brown, twisting colum bearing, inflexed or reflexed, a straw-coloured, straight, equally long arista; the flat leaf-blade is deeply grooved adaxially with simple furrows, and lacks a prominent midrib; ecologically H. quebrada on steep tropicalpine granitic soils to 4600 m is in contrast to H. juncifolia of temperate southern latitudes on volcanic, stony, or sandy soils to about 1750 m. Monoecism is exclusive to all species of Hierochloe in South America; pathways towards its evolution are outlined.
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Acknowledgements
The anatomical section was prepared for us by Dr Peter Gasson, Kew, the latin diagnosis by Dr Elizabeth Edgar, Christchurch and the illustration was drawn by Margaret Tebbs; we are grateful for their help. One of us (HEC) especially thanks Keepers at A, AK, BA, C, CANB, CHR, F, GH, L, LIL, MEL, MO, SI, TEX, UC and WELT for loans of Hierochloe.
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Connor, H.E., Renvoize, S.A. Hierochloe quebrada (Poaceae), a new species from Peru and notes on floral biology in South American species. Kew Bull 64, 727–734 (2009). https://doi.org/10.1007/s12225-009-9167-6
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DOI: https://doi.org/10.1007/s12225-009-9167-6