HITCHCOCK AND CHASE—NORTH AMERICAN PANICUM. 185 
Lovurstana: Lake Charles, Hitchcock 1128, 1143, 1148, 1153, 1154. 
Texas: Hempstead, Hall 834 in part. 
Banamas: Great Bahama, Britton & Millspaugh 2518, 2736, Brace 3697 (all in 
Field Mus. Herb.). 
104. Panicum multirameum Scribn. 
Panicum multirameum Scribn. U. 8. Dept. Agr. Div. Agrost. Cire. 19: 2. 1900. 
‘Gravelly hills near Jalapa, State of Vera Cruz, altitude 1,250 m. (4000 feet). C. G. 
Pringle 7882, 1889. Orizaba, State of Vera Cruz, February 17, Jared G. Smith, No. 
593, 1892.’’ The type, Pringle 7882, in Hitchcock’s herbarium, is the autumnal 
form with decumbent culms and numerous ascending branches, with a few vernal 
culms still attached. 
DESCRIPTION. 
Vernal culms erect or soon decumbent, 30 to 60 em. high, nodes villous-bearded; 
sheaths strongly ciliate on the margin, especially at the summit, the upper glabrous, 
the lowermost more or less villous; blades rather thick, 3 to 6 cm, long, 3 to 6 mm. 
wide, glabrous, or rarely puberulent, somewhat ciliate around the base, obscurely 
white-margined; panicles ovoid, 3 to 6 cm. long, about 
three-fourths as wide, the branches ascending; spikelets 
2 mm. long, 1 mm. wide, elliptic, finely pubescent; 
first glume one-third the length of the spikelet; second 
glume and sterile lemma equal and just covering the 
fruit at maturity; fruit 1.7 mm. long, 0.9 mm. wide, 
rather abruptly subacute. 
Autumnal form decumbent, rooting at the lower nodes, 
FiG.182.—P.multirameum. From  fahellately branching before the maturity of the primary 
type specimen. : ‘ 
panicle, the branchlets in close, appressed clusters at 
the ends of the secondary branches; blades reduced, flat or somewhat rolled, appressed ; 
panicles reduced to a few spreading branches or long-pediceled spikelets. 
None of the specimens examined shows a basal rosette of leaves. In technical 
characters this species is allied to P. nitidum but differs in the decumbent, flabel- 
lately-branched autumnal form. 
DISTRIBUTION. 
Dry hills and gravelly banks, southern Mexico. 
Mexico: Jalapa, Pringle 7882, 8339,¢ 9209, 9210; Orizaba, J. G. Smith 593, 
Bourgeau 2383 in part (all in Hitchcock’s herbarium except Pringle 8339); 
Bottert 703 in part (Gray Herb.). 
GUATEMALA: Coban, Tuerckheim 56 in part (Gray Herb.). 
105. Panicum annulum Ashe. 
Panicum annulum Ashe, Journ. Elisha Mitchell Soc. 15: 58.1898. “‘Dry rocky 
woods. Maryland to North Carolina and Georgia. Near Washington, D.C. Ward 
1892,’’ is the first specimen cited, and is taken as the type. This is in the National 
Herbarium and consists of three vernal culms with mature panicles. The year of 
collection is 1882 instead of 1892. 
Panicum bogueanum Ashe, Journ. Elisha Mitchell Soc. 16: 85. 1900. Based on 
“P_annulum Ashe, not P. annulatum A. Rich.” 1851. 
aThree species were distributed under this number: National Herbarium no. 
381990 is P. multirameum; P. sphaerocarpon is mixed with this species in the specimen 
of this number in Hitchcock’s herbarium; National Herbarium no. 823271 is P. 
olivaceum. 
