50 



GRAMINACEAE 



Cyperus — Cyperus 



(Gr. kypeiros, a sedge) 



1. Styles 2-cleft, achene lenticular, not 3-angled 



a. Stamens 2, style much exserted, scales dull C. didndrus 



b. Stamens 3, style scarcely exserted, scales shining C. rivuldris 



2. Styles 3-cleft, achene 3-angled 



a. Spikelets in heads C. filiculmis 



b. Spikelets in spikes 



(1) Spikelets flat, linear, falling away from the spikes C. esculcntus 



(2) Spikelets thicker, oblong-linear, scales falling away from the spike- 



lets C. Schweinitzii 



Dulichium — Dulichium 



(Of doubtful origin and meaning) 

 . single species D. arundinaceum 



Carex — Sedge 



(Lat. carex, sedge, i. e., that which cuts) 

 A large and difficult genus. Most of the species ripen and shed the fruit before the middle of 



Carex festucacea 

 Cluster of spikelets and fruit 



Carex lurida 

 Pistillate and staminate spikes and fruit 



September and are not in condition to be identified subsequent to that time. The following swamp 

 species retain the fruit longer and may be looked for through October. 



1. Spikes 2-5, stalked and pendulous C. comosa 



2. Spikes 2 (1-3), sessile or very short-stalked C. intumescens 



Graminaceae — Grass Family 

 Annual or perennial herbs (shrubs and trees in the Bambuseae) ; stems usually hollow, with 

 nodes and internodes ; leaves narrow, 2-ranked, with sheathing base split on the side opposite the 

 blade ; flowers in spikelets, in paniculate, racemose or spicate inflorescences ; spikelets consisting of 

 2-many, 2-ranked bracts, the two lower of which are empty, the succeeding ones, called lemmas (1- 

 many), each bear a naked, usually perfect flower; the flower is subtended on the inside by a thin scale 

 called the palet ; stamens 3, rarely 1, 2, or 6; filaments very slender, anthers long, attached at the 

 middle; pistil 1, styles 2, rarely 1-3, stigmas feathery, fruit a 1-seeded grain or caryopsis, usually 

 inclosed at maturity by the lemma and palet. 



KEY TO THE TRIBES 

 I. Plants with herbaceous stems 

 I. Spikelets all monoecious 



a. Spikelets in different inflorencences, the staminate in tassels, pistillate in 



Zea in Maydeae 



