HITCHCOCK GRASSES OF CUBA. 219 



The Grisebach specimen of Wright 3461 also belongs to this species, though it is 

 listed by him under P. dichotomum variety nodiflorum. Another specimen of this 

 was included by Grisebach under P. neuranthum; it is labeled " a forma ascendens 

 ramosa." Wright's 3461 in the Gray Herbarium is part P. chrysopsidifolium and 

 part P lancearium. The two labels are, Sandy pinales, Asiento Viejo de San 

 Julian, Dec. 1," and "Pinal. Mayan. July 24." 



This species is distinguished from P. neuranthum by the pubescent culms, bearded 

 nodes, spreading vernal panicles, and short, flat autumnal blades on zigzag stems. 

 The spikelets are 2 mm. long. It occurs in Florida and in Porto Rico (Heller 982). 



7. Panicum caerulescens Hack, in herb. 



Vernal form cespitose, of a somewhat glaucous bluish green color; culms erect or as- 

 cending, 40 to 75 cm. high, glabrous; sheaths usually less than half as long as the inter- 

 nodes, glabrous or the basal ones sparingly pubescent; blades ascending or spread- 

 ing, commonly purplish beneath, glabrous or rarely a few hairs around the base, 5 to 

 8 cm. long, 4 to 7 mm. wide, the margins nearly parallel for two-thirds their length; 

 panicles usually short-exserted, 3 to 7 mm. long, one-half as wide or less, the branches 

 narrowly ascending; spikelets 1.5 to 1.6 mm. long, 0.9 mm. wide, obovoid, blunt, 

 Aery turgid, glabrous, first glume about one-third the length of the spikelet; second 

 glume and sterile lemma subequal, the glume scarcely as long as the fruit at maturity; 

 fruit 1.4 mm. long, 0.8 mm. wide, ellipsoid. 



Autumnal form erect or leaning, sometimes, decumbent at base, producing short, 

 densely fascicled branches at the middle and upper nodes, these tufts scarcely as long 

 as the primary internodes, the reduced blades ascending, more or less involute; the 

 reduced panicles with only a lew long-pediceled spikelets. 



Closely related to P. roanokense, a species of the southern Atlantic coastal plain of 

 the United States, from which it is distinguished by the narrow panicles and smaller 

 spikelets and by the tufted branches of the autumnal form. 



The type is Hitchcock 706, "In glade among Spartina, etc., stretching up through 

 the tall grass, Miami, Florida, April 3, 1906;" U. S. National Herbarium no. 558380. 

 The name refers to the glaucous blue color. 



In marshes and swampy woods, southern Alabama and Florida, Cuba, and the 

 Bahamas. 



Wright 3463 in part; Santa Clara, Britton & Wilson 316 in Herb. N. Y. Bot. Gard. 



Wright's 3463 in the National Herbarium and in the Krug and Urban Herbarium is 

 this species. For other species distributed as 3463, see P. leucothrix, P. wrightianum, 

 and P. tenue. 



Bahamas, New Providence, "in fruticetis procumbens," Eggers 4305. 



8. Panicum compactum Sw. Adnot. Bot. 14. 1829. 



Eastern Cuba. 1856-57. Wright 710; Isle of Pines, Curtiss 291, 520, Palmer & 

 Riley 904. 



This species is distinguished by its broad, usually puberulent blades and compact 

 panicle. 



9. Panicum condensum Nash in Small, Fl. Southeast. U. S. 93. 1903. 

 Low savannas, Hanabana, May 19, Wright 3862 in part. 



In the Grisebach Herbarium there are two specimens of this species. One of them 

 has two labels, "Low wet woods, Hanabana, May 27," no. 184 of 1865, and "Wet 

 among tall Cyperaceae, in small bunches, Hanabana, May 25." The plant is 3 feet 

 tall, stout, with a compressed base, and narrow compact panicle. The other specimen, 

 which is similar, is labeled, "Palm savannas, Hanabana, May 18," 1865, no. 197. 

 This number of Wright's in the Sauvalle Herbarium and in the National Herbarium 

 is mixed with P. laxum. There is a fragment of what appears to be the same, on the 

 sheet of 3863 in the Sauvalle Herbarium. P. condensum is common in the southern 

 United States and is found also in the Bahamas (Curtiss 174). Wright's 3862 in the 



