78 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
X . . ° 
o°e Panicum Bereu Arechav.¢ a South American species with numerous leaves 
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Ve 
clustered at the base, hispid sheaths, involute blades, and very diffuse panicles, a 
third or more the entire height of the plant, with verticillate lower branches, 
conspicuously pilose in the axils, and short-pointed spikelets 2.2 to 2.6 mm. long, 
was collected on ballast at Mobile, Alabama, in July and August, 1891, by Mohr and 
at Galveston, Texas, in 1903, by Hitchcock (the latter in Hitchcock Herb.). 
Maxima s—Perennials; culms mostly robust and more than 1 meter high, simple or 
branching at the base only, or with small sterile shoots from the lower nodes; 
ligules membranaceous, ciliate; blades linear, flat; panicles large, many- 
flowered; spikelets ellipsoid, glabrous, mostly faintly nerved, the sterile 
floret with a well-developed palea and in P. maximum a staminate flower; 
fruit strongly to very obscurely transversely rugose, puberulent at the apex. 
Culms with a corm-like base. 
Blades mostly over 5 mm. wide; culms more than 1 
mae bers Lino ase tk Bey See gh pelea ys ee eS 41. P. bulbosum. 
Blades less than 5 mm. wide; culms rarely as much as 1 
TN GEE noe Sea eas pM mere oe Ty el dS ee es 41a. P. bulbosum _ sci- 
aphilum. 
Culms from a creeping rootstock, not corm-like at base. 
Nodes hirsute; ligules 4 to 6 mm. long; fruit strongly 
TUB OSE. Meets Lats tS SHS CS idee tan ds abe eee | 39. P. maximum. 
Nodes glabrous; ligules 2 mm. long; fruit very obscurely 
PUP OSC Way se ys oy iNet spo nyo e, Neteyer tes eee Steet, te eet 40. P. plenum. 
Vv 89. Panicum maximum Jacq. 
Panicum maximum Jacq. Coll. Bot. 1: 76.1786. ‘‘In insula Guadeloupe sponte 
crescit.’’ In the Vienna Herbarium is a specimen from “‘Hb. Jacq. fil.” This is 
probably the most authentic specimen to be obtained. 
The plate in Jacquin’s Icones¢ is an excellent illus- 
tration of the species as commonly understood. 
Panicum polygamum Swartz, Prodr. Veg. Ind. 
Occ. 24.1788. ‘‘ India occidentalis” is the only local- 
ity cited. The type specimen, marked ‘‘Jamaica. 
Swartz. P. polygamum prodr.,” is in the Swartz 
Herbarium. 
Panicum laeve Lam. Tabl. Encycl. 1: 172. 1791. 
‘‘E Domingo, ins. Franc.”’ is the only citation given. 
The type specimen, in the Lamarck Herbarium, is 
marked ‘‘Panicum laeven. Lam.ill.gen. * * * 
Ste. Dominique.”’ 
Panicum jumentorum Pers. Syn. Pl. 1: 83. 1805. 
Based on P. polygamum Swartz, the description of which Persoon copies. 
Panicum scaberrimum Lag. Gen. & Sp. Noy. 2. 1816. ‘‘Habitat in Nova Hispania. 
Introd. ann. 1804 ex seminibus per. D. Sessé missis.’” The type specimen, in the 
Madrid Herbarium, bears a label reading “‘ Panicum scaberrimum sp. n. Ex h. r. m.@ 
an 1804. Habitat in N. Hispania.”’ 
Fig. 67.—P. maximum. From type 
specimen of P. polygamum Swartz. 
a Anal. Mus. Nac. Montevideo 1: 147. 1894. ‘‘Campos del Departmento de Monte- 
video, San José, Florida, Mercedes, etc.”’ : 
b Nicolas Joseph Jacquin the author of the Collectiones. 
¢ Icon. Pl. Rar. 1: 2. pl. 13. 1781-1786. This work is dated 1781-1786, but “Jacq. 
coll. vol. 1” is cited, which would indicate that the Collectiones appeared the earlier. 
@ Hortus regius Matritensis. 
