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Published In: Species Plantarum 1: 232. 1753. (1 May 1753) (Sp. Pl.) Name publication detailView in BotanicusView in Biodiversity Heritage Library
 

Project Name Data (Last Modified On 8/26/2009)
Acceptance : Accepted
 

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18. Eryngium L. (eryngo) (Mathias and Constance, 1941b)

Plants annual or perennial. Stems erect, ascending, or prostrate. Leaves alternate (sometimes also basal) or opposite to whorled, the sheathing bases relatively short, not inflated. Leaf blades simple, entire or palmately lobed, the margins entire or toothed, the teeth sometimes spiny. Inflorescences terminal or axillary, dense cylindrical or globose heads of numerous flowers, these solitary or in small panicles, short- to long-stalked. Involucre subtending each head of 4–10 bracts. Flowers each subtended by a bractlet. Sepals ovate or oblong, entire or with deep, narrow, spiny teeth or lobes at the tip. Petals rounded at the tip, white, purple, or blue. Ovaries with small scales or tubercles. Fruits oblong, obovate, or nearly circular in outline, usually slightly flattened laterally, brown, each mericarp with 5 angles, lacking ribs, variously with small scales or tubercles. About 250 species, nearly worldwide.

 

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1 1. Stems prostrate, creeping, rooting at the nodes; leaves basal and opposite or whorled, entire to lobed or toothed, but not spiny; heads grayish blue ... 2. E. PROSTRATUM

Eryngium prostratum
2 1. Stems erect or ascending; leaves basal and alternate, the margins with spiny lobes or teeth or threadlike teeth; heads grayish white or purple

3 2. Leaves with netted venation, not or slightly glaucous, mostly purple-tinged; heads more or less cylindrical, purple, with conspicuous, spiny-lobed bracts at the base and a terminal crown of spiny-lobed bracts ... 1. E. LEAVENWORTHII

Eryngium leavenworthii
4 2. Leaves with parallel venation, strongly glaucous, not purple-tinged; heads more or less globose, grayish white, with inconspicuous, entire bracts at the base, lacking a terminal cluster of bracts ... 3. E. YUCCIFOLIUM Eryngium yuccifolium
 
 
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