144 



MEMOIRS OF THE NEW YORK BOTANICAL GARDEN 



[Vol. 9, No. 2 



long; blades of the midculm as much as 22 cm long, 5-9 mm wide, flat, attenuate, 

 narrowed toward the base, glabrous or sparsely pilose, especially toward the 

 base, the margins scabrous; panicle 8-12 cm long, somewhat nodding, the axis 

 glabrous, glandular-spotted, the branches somewhat distant, bearing 1-3 racemes, 

 the lower borne 0.5-2 cm from the base; racemes 2-5 cm long, spreading; rachis 

 joints and sterile pedicels densely ciliate on both sides, the hairs short toward 

 the base, lengthening upward to as much as 4 mm long, almost equaling the spike- 

 lets; sessile spikelet 5 mm long, the first glume glabrous on the back, sparsely 

 pilose below toward the margins, scabrous at the tip, the margins rounded, or 

 keeled only near the summit; fertile lemma narrow, bearing a terminal awn 15-18 

 mm long, geniculate, tightly twisted below the bend; pedicellate spikelets con- 

 spicuous, as large as the sessile spikelet, awnless; first glume of both sessile 

 and pedicellate spikelets with one or two glands about l / 4 from the tip. 



CHIMBORAZO: Canon of the Rio Chanchan, 5000-7000 ft, on open deforested 

 slope with small patches of scrub in the draws, directly above the village of 

 Huigra, May 29-31, 1945, W. H. Camp E-3470 (TYPE, US 2,011,207); same locality, 

 Camp E-3478. The latter specimen has a denser panicle with more numerous 

 racemes than the type, often four on each branch, and the lower internodes are 

 appressed-pilose. 



This species resembles and is closely related to Andropogon hirtifolius Presl, 

 rather common in southern Mexico, which differs in having fewer and coarser 

 racemes, solitary on each branch, larger spikelets 6-7 mm long, and rachis joints 

 and sterile pedicels rather evenly ciliate, the hairs on the upper part only slightly 

 longer than the rest. 



Andropogon scabriglumis Swallen, sp. nov. 



Perennis; culmi erecti, graciles, 70-80 cm alti, glabri; vaginae carinatae, 

 glabrae; laminae 18-20 cm longae, 4-5 mm latae, attenuatae, marginibus scabris; 

 racemi bini, 3-5 cm longi; spicula sessilis 6 mm. longa; gluma prima acuta, 

 scabra, apice carinata; lemma fertile bifidum, arista 15-18 mm longa, geniculata, 

 infra geniculam contorta; spicula pedicellata 7 mm longa, acuminata, exaristata. 



Perennial, in small clumps; culms slender, erect, 70-80 cm high, sparingly 

 branched, glabrous; sheaths keeled, glabrous, the lower ones much longer, the 

 upper ones somewhat shorter than the internodes; ligule inconspicuous, about 1 

 mm long; blades of the midculm 18-20 cm long, 4-5 mm wide, attenuate, scabrous 

 on the margins, otherwise glabrous; racemes ascending, 3-5 cm long, in pairs, 

 the pairs terminal on the main culm and branches, one sessile, the other with a 

 peduncle 6-8 mm long; sessile spikelet 6 mm long, the first glume acute, light 

 brown,^ conspicuously scabrous especially toward the tip, keeled toward the sum- 

 mit; fertile lemma deeply bifid, the lobes acuminate, awned from between the 

 lobes, the awn 15-18 mm long, geniculate, tightly twisted below the bend; pedi- 

 cellate spikelet 7 mm long, acuminate or awn-tipped. 



CHIMBORAZO: Canon of the Rio Chanchan, 5000-7000 ft, on open deforested 

 slope with small patches of scrub in the draws, directly above the village of 

 Huigra, May 29-31, 1945, W. H. Camp E-3472 (TYPE, US 2,011,209). TUN- 

 GUARAHUA: Banos, on rocky hill, 1800 m, A. S. Hitchcock 21919. 



By Hitchcock in The grasses of Ecuador, Peru, and Bolivia (Contr. U. S. Nat. 

 Herb. 24: 499. 1927) this species was referred to Andropogon lateralis var. incanus 

 (Hack.) Henr. In that species and variety, however, the sessile spikelet is much 

 smaller and narrower than the pedicellate spikelet, the first glume of the sessile 

 spikelet is glabrous and depressed between the keels, and the hairs on the rachis 

 joints and sterile pedicels are much longer and more conspicuous. 



