huh? Recomm: puncture 'vine' as ground cover?!?!

i was Googling for someting else, but saw this: [PDF] Enviroscaping to Conserve Energy: Ground Covers for South Florida < File Format: PDF/Adobe Acrobat - View as HTML <  che:S- 22attractive+cover,+but+spiny+fruit+can+penetrate+soft-soled+footwear%22&hl=en> Page 1. Circular EES-39 The Institute of Food and Agricultural Sciences is an equal opportunity/affirmative action employer authorized ...
Trilobus terrestris - Caltrops,     Puncture vine 18" S H H Bright green leaves, yellow flowers spring through fall X Fast, attractive cover, but spiny fruit can penetrate soft-soled footwear, thus restricting use to areas that do not receive foot traffic.
this weed's seed/fruit is poky enough to give a flat track to an Abrams tank

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