82 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
sheaths are the only characters not agreeing with those of the type of P. bulbosum. 
The author states it is closely allied to that species and scarcely different from it. 
Panicum gongylodes Jacq. Eclog. Gram. 30. pl. 21, 1815-1820. The description is 
based on a plant grown in the University garden at Vienna in 1807 from seed received 
from the Botanical Garden at Montpellier under 
the name Panicum allissimum Brouss.@ A speci- 
men labeled ‘Panicum gongylodes Jacq.’’ culti- 
vated in the garden at Vienna and preserved in 
the Vienna Herbarium is taken as authentic if 
not the type. Plate 21 of the Eclogae represents 
P. bulbosum. The date on the title-page of the 
fascicle in which this species appears, containing 
numbers 21 to 40, is 1815-1820. 
Panicum confusum Trin.; Nees, Agrost. Bras. 
174.1829. This name, credited to ‘‘ Herb. Trin.”’ 
is given as a synonym of P. gongylodes Jacq. 
No specimen so named was found in the Trinius 
Herbarium. 
Panicum nodosum Willd.; Steud. Nom. Bot. 
ed. 2. 2: 260. 1841. This isgivenas asynonym of Panicum bulbosum and credited 
to ‘Willd. hrb.”’ The type, in the Willdenow Herbarium, is P. bulboswm. 
Panicum maximum gongylodes Doell in Mart. I'l. Bras. 27: 203. 1877. Based on P. 
gongylodes Jacq. 
Panicum maximum bulbosum Vasey in Wheeler, Rep. U. 8. Surv. 100th Merid. 6: 
295.1878. Presumably based on P. bulbosum H.B.K. ‘“‘Jacq.”’ is erroneously given 
as authority for the combination. 
Panicum polygamum gongylodes Pourn. Mex. Pl. 2: 28. 1886. Based on ‘‘P. gon- 
gylodes Jacq.”’ 
Panicum bulbosum avenaceum Beal, Grasses N. Amer. 2: 132.1896. Based on P. 
avenaceum II. B. K. 
Fournier? gives a ‘‘S. -var. violaceum” under P. bulbosum II. B. K., citing ‘ Chi- 
nantla, in pratis (LIEBM[ANN] n. 451)” but giving no description. A specimen of this 
number was examined at Ialle. There is also a specimen of the same in the United 
States National Herbarium bearing the name in Fournier’s writing. 
Fia. 71.—P. bulbosum. From type 
specimen. 
DESCRIPTION. 
Plants in tufts of few to several culms, 1 to 2 meters high; culms robust, erect, gla- 
brous, the lowest internode thickened into a hard, corm-like base, 1 to 2 em, thick, 
budding at the base, sometimes one or more corms of previous years attached; sheaths 
shorter than the internodes, glabrous or scabrous to pilose toward the summit, the 
lower often appressed-pubescent at base; ligules scarcely 1 mm. long; blades erect 
or ascending, flat, 25 to 60 cm. long, 3 to 12 mm, wide, scabrous on the upper 
surface, often pilose toward the base, glabrous beneath; panicles long-exserted, 20 
to 50 cm. long, usually about half as wide, rather many-flowered, the slender, flex- 
uous branches ascending or somewhat spreading, solitary or fascicled, naked at the 
base, the branchlets 1 to several cm. long, bearing scarcely clustered, rather short- 
pediceled spikelets, the axes and pedicels very scabrous; spikelets 3.5 to 4.2 mm, 
long, 1.2 to 1.4 mm. wide, slightly pointed, more strongly nerved than in P. mari- 
mum, glabrous, commonly purplish; first glume half to two-thirds the length of the 
spikelet, bluntly pointed, 3-nerved; second glume shorter than the fruit and sterile 
lemma, the latter rarely inclosing a staminate flower; fruit 3.2 to 4 mm. long, nar- 
aThis name was listed without description in Brouss. Elench. Hort. Monsp. 42. . 
1805. We have not been able to verify this reference. 
bMex, Pl, 2: 27, 1886. 
