FIGURE 1043. — Panic/urn hillmani. Two vievvfl of spike- 

 let, and floret, X 10. (Type.) 



cially the var. occidentale, differing 

 from this in having no short flowering 

 brunches 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. O —Prairies and 

 plains, Kansas to Texas ; California. 



MANUAL OF THE GRASSES OF THE UNITED STATUS 



ered; pulvini glabrous or very sparsely 

 pilose; spikelets 2.1 to 2.2 mm. long, 

 short-pediceled, appressed, in pairs 

 at the ends of the branchlets. O 

 — Granite outcrops, Georgia. 



132. Panicum tuckermani Fernald. 

 (Fig. 1041.) Resembling P. philadel- 

 phicum and intergrading with it ; often 

 spreading or prostrate and much 

 branched at base; panicles more 

 densely flowered, the branches more 

 spreading, the axillary pulvini gla- 

 brous; spikelets somewhat racemosely 

 arranged, rather than in twos at the 

 end. O — Sandy or gravelly shores 

 and open ground, Maine and eastern 

 Canada to Connecticut and New 

 York; Ohio and Indiana to Minne- 

 sota. 



133. Panicum capillare L. Witch- 

 grass. (Fig. 1042.) Culms erect or 

 somewhat spreading at base, 20 to 80 

 cm. tall, papillose-hispid to nearly 

 glabrous; sheaths hispid; 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 roll- 

 ing before the wind; spikelets 2 to 2.5 

 mm. long. O — Open ground and 

 waste places, a weed in cultivated 

 ground, Maine to Montana, south to 

 Florida and Texas, and occasionally 

 west of this area. 



Panicum capillare var. occi- 

 dentale Rydb. Usually with short 

 flowering branches at the base; blades 

 shorter, less pubescent, crowded 

 toward the base, panicles more ex- 

 serted and divaricate; spikelets usu- 

 ally about 3 mm. long (2.5 to 3.3 

 mm.), attenuate at tip; fruit 1.7 to 

 1.8 mm. long. O (P. barbipul- 

 vinatum Nash.) — Open ground and 

 waste places, Prince Edward Island 

 and Quebec to British Columbia, 

 south to New Jersey, Missouri, Texas, 

 and California, more common west- 

 ward. 



134. Panicum hillmani Chase. (Fig. 

 1043.) Resembling P. capillare, espe- 



689 



Figure 1044. — Panicum hirticaule. Two views of 

 spikelet, and floret, X 10. (Type.) 



135. Panicum hirticaule Presl. 

 (Fig. 1044.) Culms usually simple or 

 nearly so, 15 to 70 cm. tall, papillose- 

 hispid to nearly glabrous; b.'ades 5 to 

 15 cm. long, 4 to 13 mm. wide, often 

 cordate at base, sparsely hispid or 

 nearly glabrous, ciliate toward base; 

 panicles 5 to 15 cm. long, scarcely 

 one-third the entire height of the 

 plant; spikelets 2.7 to 3.3 mm. long, 

 lanceolate-fusiform, acuminate, usu- 

 ally reddish brown; first glume half 

 to three-fourths the length of the 

 spikelet; fruit 2 mm. long. — 

 Rocky or sandy soil, Arkansas and 

 western Texas to Southern California; 

 Mexico to western South America; 

 Argentina. 



