35 



Fig. 21. Amphicarpum purshii Kunth.— a and b, Staminate spikelets; c, floret 

 of same: d, a fertile spikelet from one of the underground branches. One other 

 species from Florida is illustrated by figure 33 in Bui. 7. 



21. AMPmCAKPTJM Kunth. Rev. Gram. I: 28. 1835. Spikelets (by abor- 

 tion) unisexual, 1-fiowered, the staminate in a narrow terminal panicle, the 

 pistillate much larger, solitary, terminal on slender leafless runners at the base 

 of the culm and cleistogamous. Glumes 3, awnless, slightly unequal, the 1st and 

 2d empty, membranous, the 3d in the fertile spikelets firmer in texture and 

 becoming indurated in fruit. Stamens 3. Styles distinct; stigmas plumose. 

 Grain oblong, inclosed within the hardened floral glume and palea. Erect 

 perennials, with flat leaves and terminal panicles. 



Two known species, natives of eastern North America. 



