MANUAL OF THE GRASSES OF THE UNITED STATES 



667 



sandy ground, Connecticut to Wisconsin, south to Georgia and 

 Texas (fig. 1488). 



124. Panicum tuckermani Fernald. (Fig. 1489.) Resembling P. 

 philadelphicum and intergrading with it; often spreading or prostrate 

 and much branched at base; panicles more densely flowered, the 

 branches more spreading, the axillary pulvini glabrous; spikelets 

 somewhat racemosely arranged, rather than in twos at the end. 

 O — Sandy or gravelly shores and open ground, Maine and Quebec 

 to Connecticut and New York; Indiana, Wisconsin (fig. 1490). 



125. Panicum capillare L. W t itchgrass. (Fig. 1491.) Culms 

 erect or somewhat spreading at base, 20 to 80 cm tall, papillose-hispid 



Figure 1485.— Panicum gattingeri. 

 Two views of spikelet, and 

 floret. X 10. (Type.) 



Figure i486.— Distribution of 

 Panicum gattingeri. 



Figure 1487.— Panicum 

 philadelphicum. Two 

 views of spikelet, and 

 floret, X 10. (Type coll.) 



to nearly glabrous; blades 10 to 25 cm long, 5 to 15 mm wide, hispid 

 on both surfaces; panicles densely flowered, very diffuse, often half 

 the length of the entire plant, included at the base until maturity, 

 the branches finally divaricately spreading, the whole panicle breaking 

 away and rolling before the wind; spikelets 2 to 2.5 mm long. © — 

 Open ground, fields and waste places, Maine to Montana, south to 

 Florida and Texas, and occasionally west of this. 



Panicum capillare var. occidentale Rydb. Blades shorter, 

 less pubescent, crowded toward the base, panicles more exserted and 

 divaricate; spikelets usually about 3 nun long (2.5 to 3.3 mm), 



Figure 1488.— Distribution'tof 

 Panicum philadelphicum. 



Figure 1489.— Panicum 

 tuckermani. Two 

 views of spikelet, and 

 floret, X 10. (Type 

 coll.) 



Figure 1490.— Distribution of 

 Panicum tuckermani. 



attenuate at tip; fruit 1.7 to 1.8 mm long. © (P. barbipulvinatum 

 Nash.) — Open ground and waste places, Prince Edward Island and 

 Quebec to British Columbia, south to New Jersey, Missouri, Texas, 

 and California, more common westward. 



126. Panicum hillmani Chase. (Fig. 1492.) Resembling P. 

 capillare, especially the var. occidentale, differing from this in having 

 no short flowering branches at the base, in the stouter culms, firmer 

 foliage, stiffer panicle branches with the lateral spikelets on shorter 

 more appressed pedicels, in the well-developed sterile palea, and 

 especially in the larger darker fruit (2 mm long) with a prominent 

 lunate scar at the base. © — Prairies and plains, Kansas to Texas. 



