MANUAL OF THE GRASSES OF THE UNITED STATES 



463 



Figure 1000.— Distribution of 

 Tragus racemosus. 



Figure 999.— Tragus 

 racemosus, X 1. 

 (Griffiths 1529, 

 Ariz.) 



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. 6 (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. (Fig. 999.) Differ- 

 ing from T. berteronianus in the larger burs, the 

 spikelets 4 to 4.5 mm long, in the acuminate apex 

 projecting beyond the spines, and in the pediceled 

 burs, o {Xazia 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 



