162 CONTRIBUTIONS PROM llll NATIONAL HERBARIUM. 



2 DichronuM. lecht. <fc Cham Linnaea 6: > If 



\ '.ihl. I'.iniiii. 2: _' I ! . 1^0'.. in part . 

 cm a pa Boerkl. I. inn... a 37: 529. 

 Distribi ii"N « • ntral America, tropical Routh America; also in the Weal Indies, 

 i|uii<- common 



. Rican coLLBcno R ;..■ 1 de ( Sartagi i P 



13. RYNCHOSPORA \ .1.1 

 Glumee in many spirals or elae obscurely 2-ranked; '■) or more "i" the lowei empty, 

 \ . I..1 above these bisexual and nut-bearing, the uppermost Btaminate or empty; 

 hypogynoufl bristles sometimes wanting, when present 6 or 7, irregulai 

 2, anterior; style bifid, in the series of the Haplostyleae very long, at ap< \ shortly 

 bidentate, in il" the Diplostyleae deeplj cleft, the branches linear; nut obo- 



void, compressed, crowned with the conical and persistent Btyle base. Inflorescence 

 capitate or panicled, near umbellate I • - always <>\>\ ious, Linear. 



KIN i . I ill I BPBCTEG 



Style long; the two branches short . or-almost Done. Baplostyli \ \ 



Stem monocephalous. Monocephala] I. R. globota. 



Heads globose, several, rarely but one. Polycephalai 2 /.' cyperoukt. 

 Spikeleta solitary or fascicled, ■ 1 isj >i »>< •< I in corymbs < \ 



1 S PTROBT1 I i \ i 



Spikeleta yellow . or \ ellow-brown •">. R. aurea. 



Spikeleta from greenish to chestnut brown. 



Stem-leaves many, approximate; bristles none .,.. l. />'. polyphylla. 

 Stems less densely leafy; l>ri<tli> often obvious. 

 Spikeleta green, or somewhat chestnut-tinged. 



Spikeleta 7 to 8 mm. l<>i.L r 5. R. tchiedeama. 



Spikeleta 3 to A mm. Long 6. R. loruples. 



Spikeleta chestnut-brown or tawny. 



Bristles of about the length of the nut ..... 7. R. macrochaeta. 



Bristles longer than the very small nut s . R. vuiccmi. 



Style linear; branches 2, Linear, Longer than tin- undivided pari. 



I > l II < iv i JTLBA1 



Bristles Done. Psilosi \. bys. 

 N hi ir;.n>\ ersely undulate. 



Style base depressed, Dearly discoid 9. /»'. arimia. 



Style base pyramidal 10. R. robusta. 



Nut smooth, Dot undulate. 



Spikeleta '■> nun. long II. R. longtipicata. 



Spikelets 2 to 3 mm. Long 12. R. clarkei. 



Bristles scabrous anteriorly; nut smooth; head solitary, I i<> 



l cm. long. Fuscae) 13. R.a phalotes. 



Bristles scabrous anteriorly; nut transversely undulate. 



< .1 LU( \ i 



Spikeleta more or L< bs faacicled in the corymbs. 



Peduncles of the corymbs slender, uodding II. R. glauca. 



Peduncles of th< corymbs strictly erect..... L5. R. schaffneri. 



Spikeleta mostly solitary L6. R. marisculu*. 



1. Rynchospora globosa Eloeni. & Schult. Syst. 2: 89. 1817. 

 Chaetospora globosa 11. B. k. Nov. Gen. & Sp. 1: 230. L815. 

 Schoenus globosa Poir. Encyc. Suppl. 5: <il7. L817. 

 Cephalo8choenu8 globosity Nees, Linnaea 9: 296. L834. 

 Cephalo8choenu8 marginatus Liebm. Dansk. Vid. Selsk. Skr. 2: 63. L849. 

 Rynchospora marginaia Steud. Syn. PI. Glum. 2: J 12. L865. 



