Part 3, 1915] POACBAB 



249 



108. Panicum arenicoloides Ashe, Jour. Elisha Mitchell Soc. 16: 89. 



1900. 



Panicum orthophyllum Ashe, Jour. Elisha Mitchell Soc. 16: 90. 1900. 



Vernal phase intermediate in appearance between that of P. angustifolium and P. acicu- 

 lare, grayish-green, slender, mostly 30-50 cm. high; lower leaf -sheaths and blades softly villous; 

 blades 7-12 cm. long (the lower shorter), 3-4 mm., rarely 5 mm. wide, tapering from the base to a 

 more or less involute apex; panicles 4-6 cm. long, two thirds to three fourths as wide, the lower 

 branches ascending; spikelets 2.1-2.5 mm. long, 1.2-1.3 mm. wide, obovate, obtuse; first glume 

 one third the length of the spikelet, truncate or pointed; second glume and sterile lemma scarcely 

 covering the fruit at maturity, papillose-pubescent; fruit 1.8-1.9 mm.long, 1.1-1.2 mm. wide, 

 obscurely puberulent at the apex. 



Autumnal phase bushy-branching, erect or topheavy, the blades involute ; spikelets more 

 turgid, the attenuate base in exceptional specimens elongate, lengthening the spikelet to as 

 much as 2.8 mm. 



Type locality: Wilmington, North Carolina. 



Distribution : North Carolina to Florida and eastern Texas; Guatemala. 



Illustration: Contr. U. S. Nat. Herb. 15: /. 166. 



109. Panicum ovinum Scribn. & Smith; Scribn. Circ. U. S. Dep. Agr. 



Agrost. 16: 3. 1899. 



Vernal phase with culms usually few in a cluster, erect or nearly so, glabrous, 30-50 cm. 

 high; leaf -sheaths glabrous or the lowermost appressed-pubescent ; blades erect or ascending, 

 stiff, glabrous, the lower somewhat ciliate on the margin at base, the lowermost ovate or lan- 

 ceolate, as much as 1 cm. wide, those of the mid-culm 10-15 cm. long, 3-6 mm. wide, the upper- 

 most shorter and narrower; panicles usually short-exserted, 5-9 cm. long, three fourths as wide 

 or less, loosely flowered, the lower branches ascending; spikelets 2.1-2.2 mm. long, 1.2-1.3 

 mm. wide, obovate-elliptic, obtuse, the basal attenuation short ; first glume about one fourth the 

 length of the spikelet, usually truncate ; second glume and sterile lemma scarcely equaling the 

 fruit at maturity, papillose-pubescent, sometimes minutely so; fruit 1.8 mm. long, 1.1 mm. 

 wide, oval, puberulent at the apex. 



Autumnal phase erect or nearly so, the blades becoming loosely involute, not much 

 shorter than the vernal blades; spikelets more turgid, sometimes slightly shorter than those 

 of the primary panicle. 



Type locality: Waller County, Texas. 



Distribution: Arkansas to Mississippi and eastern Texas; Vera Cruz. 



Illustration: Contr. U. S. Nat. Herb. 15: /. 168. 



m 



110. Panicum neuranthum Griseb. Cat. PL Cub. 232. 1866. 



Vernal phase with numerous cespitose, stiff, erect, glabrous culms, 30-60 cm. high; leaf- 

 sheaths glabrous or ciliate on the margin and usually with a few long hairs at the summit, or 

 the lowermost sparsely ascending-pubescent; blades erect or ascending, glabrous or with a few 

 cilia toward the base, the short basal blades few or wanting, those of the middle culm usually 

 10-15 cm. (sometimes only 5-6 cm.) long, 3-5 mm. wide; panicles finally long-exserted, 5-9 

 cm. long, narrow, the flexuous branches narrowly ascending, rarely loosely spreading, the 

 branchlets appressed, the short-pediceled spikelets more or less secund along the branches; 

 spikelets 2 mm. long, 1.2 mm. wide, broadly obovate, blunt, the attenuation at base short; 

 first glume about one third the length of the spikelet, truncate or pointed; second glume and 

 sterile lemma scarcely equaling the fruit at maturity, finely papillose-pubescent; fruit 1.8 mm. 

 long, 1.1 mm. wide, elliptic, puberulent at the subacute apex. 



Autumnal phase with erect, usually slender culms nearly as tall as the vernal form ; blades 

 involute but not stiff, not conspicuously shorter than the vernal blades, 4-10 cm. long; spikelets 

 more turgid, the fruit often slightly exceeding the second glume. 



Type locality: Eastern Cuba. 



Distribution: Southern Florida and Mississippi; Cuba. 



Illustrations: Contr. U. S. Nat. Herb. 15:/. 170; Britt. & Brown, 111. FI. 3: App. /. 269a. 



