92 KANSAS ACADEMY OF SCIENCE. 



c. Spikes 1 in. long, 2 or 3 together, in distant clusters, shorter than bracts 8 



c. Spikes 1-2 inches long, slender, single and scattered, not as above 3 



c. Spikes in pairs or clustered, or digitate (d). 



d. Stamens 3, spikes digitate, hairs short and sparse 5 



d. Like the above, but glaucous, villous with white or yellowish hairs 6 



d. Fert. fl. with 1 stamen, spikes in pairs or fours, hairs long, white, dense 7 



2. Andropogon tener Kunth. ; Broom grass. 



3. A. scoparius Mx.; Little Blue Stem, Wood grass, Broom grass. 



4. A. macrourus Mx.; Heavy-topped Broom grass. 



5. A. provincialis Lam.; Big Blue Stem, Broom grass. 



6. A. Hallii Hack.; Hall's Broom grass. 



7. A. saccharoides Swz.; Broom grass. 



8. A. Virginicus L.; Broom grass. 



9. A. nutans L.; Wood grass, Indian grass, Bushy Blue Stem. 



3. Paspalum L. 



a. Spikelets two-rowed (b). 



a. Spikelets four-rowed, dense, orbicular, and obtuse 10 



6. Spikes with a thin and keeled rachis with incurved margins 11 



b. Spikes not as above (c). 



c. Spikelets ^ line wide, narrowly two-rowed 12 



c. Spikelets over one line wide, broadly two-rowed 13 



10. Paspalum virgatum L. 



11. P. fluitans Kunth.; Marsh Paspalum. 



12. P. setaceum Mx.; slender Paspalum. 



13. P. laive Mx.; smooth Paspalum. 



4. Eriochloa H. B. K. 

 a. Stem erect, the nodes and stem above pubescent 14 



14. Eriochloa punctata Hamilt. 



5. Panicum L. 



a. Spikes mostly digitate, flat, one-sided (b). 



a. Spikelets imbricate-spiked, panicle simple or comp., often with stiff hairs (c). 



a. Spikelets scattered, in panicles (d). 



6. Spikelets ovoid, about 1 line long, second glume equaling the flower 15 



6. Spikelets oblong, about 11 lines long, second glume £ length of flower 16 



c. Panicle dense, spikes 1-3 inches long, more or less compound 31 



c. Panicle slender, its branches simple, the perfect flower less pointed; resembles small and 



smooth forms of the last 32 



d. Panicle small, narrow, branches few, erect (e). 



d. Panicle small but diffuse, oval or oblong (/). 



d. Panicle larger, oval or oblong (g). 



d. Panicle effuse, branches capillary and much subdivided (j). 



d. Panicle ample and diffuse; tall grasses (I). 



e. Lvs. 5-10 lines wide, strongly 9-11 nerved, margin scabrous 26 



e. Lvs. erect, narrowly linear, sheaths usually pubescent 30 



/. Spikelets f-1 line long; plant very variable 29 



/. Spikelets l|-lf lines long; also variable 28 



g. Velvety-downy all over, except a narrow ring below each node 27 



g. Smooth or hairy, but not as above {h). 



k. Lvs. broadly lanceolate from a cordate base, 3-4 in. long, £-l£ in. wide 23 



h. Lvs. 4-8 inches long, lanceolate or oblong-lanceolate (t). 



i. Spikelets oval, five-eighths of a line long, culms stout, smooth 25 



i. Spikelets oblong-ovate to obovate, 1J lines long, culms rigid, leafy to top 24 



j. Panicle \-\ length of culm, culm erect or decumbent below (k). 



j. Panicles terminal and lateral, culms decumbent, stout, sheaths flattened 19 



k. Panicles $-§ length of plant, much branched, sheaths very hairy 20 



k. Panicle |-i length of plant, very effuse, capillary branches long, sparingly divided 21 



I. Panicles terminal and lateral (m). 



1. Panicles terminal only, 6-18 in. long, culm S-6 ft. high 22 



