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Key to Ammoselinum

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1 Umbels sessile (the rays arising directly from the leaf axil); fruit ribs glabrous (or slightly roughened); ultimate leaf-segments oblong-spatulate, > 0.5 mm wide; plants 4-5 cm tall
1 Umbels pedunculate; fruit ribs roughened with well-developed teeth (corky appendages); ultimate leaf-segments linear, < 0.5 mm wide; plants 10-35 cm tall