FEB. 1903. PLANTS YUCATAN^: MILLSPAUGH & CHASE. 23 



ANTHEPHORA Schreb. Gras. 2:105. 



Spikelets i -flowered, 4-5 together, each group surrounded by an 

 indurated pitcher-shaped pseudo-involucre formed by the first empty 

 glumes of the spikelets, connate at the base and deciduous with them 

 at maturity. Grain oblong, free. Stamens 3. 



Anthephora elegans Schreb. Gras. 2:105, t. 44. 



Spike long exserted, 7-15 cm. long, pseudo-involucres 4-ranked, 

 of 4-5 spikelets, only i or 2 perfecting fruit. Involucral (first) glumes 



7 mm. long, pale green, ovate, 

 acute, finely many nerved, hispid, 

 ciliate. Spikelets 1.8x4.5 mm., 

 lanceolate-ovate; second glume y$ 

 the length of third, hyaline, ovate, 

 cuspidate-acuminate, i -nerved, hir- 

 sute; third hyaline, acute, 7-nerved, 

 hirsute, enfolding the fruiting 

 glumes; floral glume nearly the 

 length of third, firmer, ' 5-nerved, 

 glabrous, enfolding a similar 

 2-nerved palea. Grain brownish- 

 white, oblong i.i X2 mm.; in section oblong with rounded sides. 



Hab. Merida, Sept., and Hacienda San Rafael, Schott 549; 

 along fences in sheltered places, 16 inches high, not common, Gaumer 

 314; in old fields, i foot high, common, Izamal, June to Jan., Oct., 

 IOJO, Chichankanab 1597 and Calotmul 1644. 



SYNTHERISMA Walt. Fl. Car. 76. 



Digit aria Scop, non Heist. 



Inflorescence composed of i -sided digitate or panicled linear 

 racemes. Rachis 3-angled, lateral angles often broadly winged. 

 Spikelets i -flowered, perfect, usually in pairs, sometimes in 3's or 4's, 

 alternate in 2 rows, rachilla articulated below the empty glumes. 

 Glumes 3 or 4; empty glumes thin or membranaceous, fruiting glumes 

 indurated but less so than in Panicum, papillo-striate; the floral 

 glume with hyaline margins, not inrolled as in Panicum and Paspa- 

 lum. Grain ellipsoid, dorsally compressed, enclosed within the fruit- 

 ing glumes, free. Stamens 3. 



Spikelets enveloped in long silky hairs insulare. 



Spikelets nearly glabrate or with short hairs: 



More than 3 mm., empty glumes 3 sanguinale. 



Less than 2.5 mm., empty glumes 2: 



Lowest glume H the length of spikelet, blunt, fruit- ) frf 



ing glumes chestnut \ JlltJOt 



Lowest glume y z the length of spikelet, acuminate, [ . j a 

 fruiting glumes greenish purple 



Syntherisma insulare (L.) comb. nov. 



Andropogon insularis L. PI. Jam. Pugill. 30. 

 Panicum insulare Meyer. 

 Panicum lanatum Rottb. 

 Panicum leucophaum H. B. K. 

 Trichachne lanatum Nees. 



