100 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
50. Panicum agrostoides Spreng. 
Panicum agrostoides Spreng. Pl. Pugill. 2:4. 1815. Sprengel first. gives an original 
diagnosis, then cites “‘P. agrostidiforme Lam. ill. n. 895. encycl. 4. 738. Habitare 
videtur in Cayenna. Misit etiam Mithlenbergius e Pensylvania.”” Then follows an 
ample description which applies to the plant bearing the name Panicum agrostoides and 
marked as sent by Muhlenberg which is found in the Willdenow Herbarium. Spren- 
gel’s herbarium is not segregated from the general herbarium at Berlin, as is Willde- 
now’s, and no specimen marked Panicum agrostoides from Muhlenberg was found in the 
general herbarium. Sprengel’s description was doubtless based on the specimen in 
the Willdenow Herbarium, which is therefore taken as the type, the citation of La- 
marck’s name @ as asynonym being erroneous. It would seem that the name P. agros- 
toides was given by Muhlenberg on the specimen sent to Willdenow, since Muhlenberg 
shortly after 6 published this as a new species of his own.¢ In the Muhlenberg Herbar- 
ium specimens of both this species and of ?. stipitatum are found in the cover marked 
“Panicum agrostoides M.”’ 
Panicum rigidulum Bosc; Spreng. Syst. Veg. 1: 320. 1825. This is given as a 
synonym of P. anceps Michx. and is based on P. “rigidulum Bosc. (W.herb.).”’ The 
specimen in the Willdenow Herbarium is P. agrostoides. Pani- 
cum rigidulum was described by Nees@ as a new species with 
Bosc as the author, and based on the specimen in the Willdenow 
Herbarium. 
Agrostis polystachya Bosc; Steud. Nom. Bot. ed. 2. 1: 40. 
1840. This is given as a synonym of 1. composita Poir. No 
locality is cited. A specimen in the De Candolle Herbarium, 
collected in Carolina by Bose, is referable to P. agrostoides. In 
Fig. 92.—P. agrostoides. the Delessert Herbarium are two specimens labeled by Bosc as 
From type specimen —_4grostis polystachya; one is Panicum anceps and the other is P. 
in Willdenow Herba- 
rium. 
virgatum. 
Panicum elongatum ramosior[ius] Mohr, Contr. Nat. Herb. 6: 
357. 1901. ‘ALABAMA: Damp cultivated ground. Mobile County, Pierce’s Land- 
ing.’ The type specimen, in the Mohr Herbarium, collected by ‘C. Mohr, Oct. 
1885,”’ isa portion of a plant with an unusually large and open panicle. 
This species was described by Nashé under the name of P. agrostidiforme Lam. 
DESCRIPTION. 
Plants in dense clumps, from a short caudex, with numerous shoots of short leaves at 
the base, erect, glabrous throughout except as noted, 50 cm. to | meter or more high; 
culms rather stout, compressed; sheaths longer than the internodes, keeled, occasion- 
ally pilose on the sides at the juncture with the blade; ligules erose, about 1 mm. long; 
blades erect, conduplicate at the base, but flat above or sometimes drying involute, 
20 to 50 em. long, rarely longer, 5 to 12 mm, wide; panicles terminal and axillary, 
finally long-exserted, 10 to 30 cm. long, rarely longer, usually half to two-thirds as wide 
but occasionally diffuse and nearly as wide as long, the stiff branches ascending or 
sometimes spreading at maturity, with more or less divergent, densely flowered branch- 
lets, commonly from the lower side, the ultimate branchlets and short pedic les 
a a Panicum agrostidiforme Lam., the typeof which is in the Lamarck Herbarium, i is 
P. lacum Swartz. 
b Descr. Gram. 119. 1817. 
¢ Sprengel does not include his P. agrostoides in the Systema [Syst. Veg. 1: 319. 
18] but gives P. agrostoides Muhl. asasynonym of P. proliferum. 
d Acrost. Bras. 163. 1829. 
é Britt. & Brown, Ilust. Fl. 1: 115. f. 249. 1896. 
