MANUAL OF THE GRASSES OF THE UNITED STATES 



463 



1. Tragus berteronianus Schult. (Fig. 998.) Culms branched 

 at base, spreading, 10 to 40 cm long; blades firm, mostly less than 5 

 cm long, 2 to 4 mm wide, the cartilaginous margin 

 bearing stiff white hairs or short slender teeth ; raceme 

 dense, 4 to 10 cm long, 4 to 5 mm thick; burs 2 to 3 

 mm long, nearly sessile, the apex scarcely exceeding 

 the spines, o (The name 

 Nazia aliena Scribn. has been 

 erroneously applied to the spe- 

 cies.) Dry open ground, prob- 

 ably introduced, Texas to 

 Arizona, south to Argentina; 

 also in the warmer parts of the 

 Old World; on ballast at Boston 

 and on wool waste in Maine. 

 2. Tragus racemosus (L.) All. 



FIGUEE 1000. Distribution of 

 Tragus racemosus. 



'~ x r T m ? fr m 



(Fig. 999.) Differ- 

 berteronianus in the larger burs, the 



^ 



(Griffiths 1529^ spikelets 4 to 4.5 mm long, in the acuminate apex 

 projecting beyond the spines, and in the pediceled 

 burs, o (Nazia racemosa Kuntze.) Waste ground and on ballast 

 at a few places from Maine to North Carolina; Texas to Arizona 

 (fig. 1000); introduced from the Old World. 



ANTHEPHORA Schreb. 



Spikelets with 1 perfect floret and a sterile lemma below, in clusters 

 of 4, the indurate first glumes united at base, forming a pitcher-shaped 

 pseudo-involucre, the clusters subsessile and erect on a slender flexuous 

 continuous axis, deciduous at maturity. Type species, Anthephora 

 elegans Schreb. (A. hermaphrodita) . Name from anthe, blossom, and 

 pherein, to bear. 



Anthephora hermaphrodita (L.) Kuntze. Leafy ascending or 

 decumbent annual; culms mostly 20 to 50 cm tall; blades flat, thin, 5 

 to 10 mm wide; spikes erect, 5 to 10 cm long; first glume 5 to 7 mm 

 long, about 9-nerved; second glume narrow, acuminate, shorter than 

 the first, pubescent; sterile lemma 5-nerved, about as long as the 

 fertile floret, o Escaped from Experiment Station plots, Florida 

 (Gainesville) ; a common weed in tropical America. 



87. ZOYSIA Willd. 



(Osterdamia Neck.) 



Spikelets 1 -flowered, laterally compressed, appressed flatwise 

 against the slender rachis, glabrous, disarticulating below the glumes; 

 first glume wanting; second glume coriaceous, mucronate, or short- 

 awned, completely infolding the thin lemma and palea, the palea 

 sometimes obsolete. Low perennials, with creeping rhizomes, short, 

 pungently pointed blades, and terminal spikelike racemes, the spike- 

 lets on short appressed pedicels. Type species, Zoysia pungens Willd. 

 Named for Karl von Zois. 



Several years ago a species of this genus was introduced into the 

 United States as a lawngrass under the names Korean lawngrass and 

 Japanese lawngrass. It was recommended for the Southern States 

 and was said to be hardy as far north as Connecticut. The species 



55974 35 - 30 



