% ta ies 
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Grasses OF Porto RIco 379 
14. DIMORPHOSTACHYS Fourn. Comptes-Rendus Acad. 
Far: 60%: 441i 1875 
1. DIMORPHOSTACHYS PEDUNCULATA (Poir.) Fourn. Mex. Pl. 2: 
15. 1886. 
Paspalum pedunculatum Poir. in Lam. Encycl. Suppl. 4: 315. 
1816. 
Adjuntas road, near Ponce, Heller 6354. 
15. PANICUM. Ly Sp, Pl. 55-1753 
1. Apex of the panicle-branches not extending beyond the insertion of the spikelets. 
a. Stems herbaceous. 
Spikelets scattered, on long pedicels of varying length. 
Fourth scale of the spikelet smooth : low grasses, less than 5 dm. tall. 
Panicle large and effuse, over 1 dm. long: spikelets numerous, less 
than 1.5 mm. long. 
Leaf-blades narrowly ovate, rarely exceeding 7 cm. long: 
spikelets r mm. long. 1. 2. brevifolium., 
Leaf-blades lanceolate, rarely less thant dm. long: spikelets 
1.3 mm. long. 2. P. trichanthum. 
Panicle small, less than 1 dm. long: spikelets few, 1.5 mm. long or 
more. 
Stems erect, if prostrate in age never rooting at the lower nodes. 
Spikelets less than 2 mm, long. 
Leaf-blades with the upper surface hirsute, the larger 
over I cm. wide, 3. P. comophyllum. 
Leaf-blades with the upper surface glabrous or merely 
puberulent, less than 5 mm. wide. 
4. B. Nashianum. 
Spikelets more than 2mm. long. 5. /. consanguineum. 
Stems erect only toward the end, the base prostrate and rooting 
at the lower nodes. 
Leaf-blades lanceolate, pubescent, less than 5 mm. wide. 
6. P. parvifolium. 
Leaf-blades ovate-lanceolate, more than 5 mm. wide. 
7. P. oplismenoides. 
Fourth scale of the spikelet transversely rugose : tall stout grasses. 
8. P. maximum. 
Spikelets crowded on short nearly equal pedicels, in short clusters on one side 
of the panicle-branches. 
Outer scales of the spikelet with cross-veinlets connecting the longitu- 
dinal nerves. 9. £. paniculatum. 
Outer scales without cross-veinlets. 
Fourth scale of the spikelet transversely rugose. 
Spikelets about z mm. long: stems slender : leaf-blades ovate- 
lanceolate, usually less than 5 cm. long. 
Io. P. prostratum. 
