124 MISC. PUBLICATION 243, U.S. DEPT. OF AGRICULTURE 
nearly twice as long, and in the larger spikelets. S. fasciculata is now 
known from several localities. It is uniformly smaller and more 
delicate than S. plevostachya. 
54. CHLORIS Swartz, Prodr. Veg. Ind. Occ.25. 1788. Fincerarass 
Spikelets with 1 perfect floret, sessile, in two rows along one side of 
a continuous rachis, the rachilla disarticulating above the glumes, 
produced beyond the perfect floret and bearing 1 to several reduced 
florets consisting of empty lemmas, these often truncate, and, if more 
than one, the smaller ones enclosed in the lower, forming a usually 
club-shaped rudiment; glumes somewhat unequal, the first shorter, 
narrow, acute; lemma keeled, usually broad, 1- to 5-nerved, often villous 
on the callus and villous or long-ciliate on the keel or marginal nerves, 
awned from between the short teeth of a bifid apex, the awn slender 
or sometimes reduced to a mucro, the sterile lemmas awned or awn- 
less. Perennials or annuals with flat or folded blades and 2 to many 
often showy digitate spikes. 
Lemmas awnless; spikes dark brown (Hustachys)____________~_ 1. ©) PerRAnA: 
Lemmas awned; spikes pale or purplish. 
Sterile floret narrow, the apex acute or obtuse but not truncate. 
Plants 1 to 1.5 m tall, with stout creeping stolons__________ Pa LOE CUAVEAIS 
Plants lower; stolons wanting or poorly developed. 
Spikes numerous, at least 10, ascending even when mature. 
3. C. RADIATA. 
Spikes fewer than 10, usually not more than 6. 
Culms leafy throughout; spikes erect or ascending___4. C. RUPESTRIS. 
Culms naked or with a few remote short blades. Spikes often reflexed 
at maturity. 
Spikelets divergent, somewhat distant. Plant delicate. 
5. CO. CRUCIATA. 
Spikelets appressed, imbricate. 
Culms slender, wiry; blades filiform or narrow____6. C. EKMANII. 
Culms stouter; blades flat or folded, 1 to 3 mm wide. 
Leaves pubescent; awns 1.5 to 2.5 em long____.9. C. ARENARIA. 
Leaves glabrous; awns 1 to 2 em long. 
Lemma pilose-ciliate on upper part of margins; callus pilose; 
rudiment rather broad and prominent___8. CC. CUBENSIS. 
Lemmas minutely pilose or nearly glabrous on the margins; 
callus nearly glabrous; rudiment not prominent, mostly 
enclosed in the margins of the lemma__7. C. SAGRAEANA. 
Sterile floret broad, truncate, broadest at the summit. Spikelets pectinately 
arranged. 
Plants perennial, commonly more than 1 m tall; spikes flexuous, 8 to 10 cm 
Venere ee ON ek dts ar aaa pty Er ek ae 10. , C. POLYDACTYLA, 
Plants annual, usually less than 75 cm tall; spikes less than 8 cm long. 
Awn of fertile lemma not longer than the body; lemma long-ciliate on 
keel andi mang ng. .005 Me 500 Me RNa py tke aulvigh ne Wey een 11.) Cy crmAmar 
Awn of fertile lemma at least twice as long as the body. 
Sterile florets 2; sterile lemmas (rudiment) nearly as broad as long; 
fertile lemma without tuft of hairs.._._._._.____-- 2. CU InEnAmAS 
Sterile floret 1; sterile lemma narrow, more than twice as long as 
broad, hairy on the keel and margins_________-_ 13. ©. vIRGATA. 
1. Chloris petraea Swartz, Prodr. Veg. Ind. Occ. 25. 1788. Jamaica. 
Eustachys petraea Desv., Nouv. Bull. Soc. Philom. Paris 2: 189. 
1810. 
Schultesia petraea Spreng., Pl. Pugill. 2: 17. 1815. 
Chloris swartzii C. Muell., Bot. Ztg. 19: 341. 1861. Based on 
C. petraea Swartz. 
