28 ARKIV FÖR BOTANIK. BAND 13. N:0 3. 



in cuspidem excurrentes, ceterae pilis ferrugineis 



ciliatse.) — — — — — — — 



\/ Stirps (XIV) X. Spruceance p. 75. 



ß. Sepala lateralia 6 mm longa v. etiam longiora. 

 Species elatiores. 

 aa. BraotesG spicse area dorsali discolore ornatse, 

 infimae söepissime in cuspidem compressam ex- 

 currentes. Carina sepalorum lateralium superne 



villosa. — — — — — — — — — — 



/' Stirps (XVII) X. graminosce — — — p. 79. 



ßß. Bracteae area dorsali destitutse, infimse acutse 

 v. acuminatse. Carina sepalorum lateralium 

 ciliato-scabridula. — — — — — — — — — 



— Stirps (IX) X. hystricis — — — p. 68. 



b. Bracteae infimae spicae intermediis breviores (rarius 

 eas fere aequantes at in cuspidem compressam non 

 excurrentes). 



a. Spica (valde multiflora) strobilacea, subcylin- 

 drica, ellipsoidea v. fusiformis, Bracteae inter- 

 mediae dimidia spica breviores. 

 aa. Bracteae spicae area dorsali destitutae. (Folia 

 transverse rugulosa v. tuberculata. Carina 

 sepalorum lateralium superne lacerato-fimbriata.) 



Stirps (XIII) X. ciliatcE p. 74. 



ßß. Bracteae area dorsali notatae. 



aaa. Bracteae intermediae spicae pilis ferrugineis v. 



fulvescentibus ciliatae, area dorsali transversa. 



Sepala lateralia apice villosa. (Folia 2 — 3 mm 



lata, crasse cartilagineo-marginata.) 



— — — Stirps (XV) X. lomatophyllcB — p. 78. 



ßßß. Bracteae eciliatae, area dorsali ovata v. ovato- 



lanceolata. Ala carinalis sepalorum lateralium 



serrulato-ciliata, ciliato-scabridula v. subnuda. 



+ Elata, foliis 20 — 30 cm longis, 1,5 — 2,5 mm 



latis, crasse cartilagineo-marginatis, scapis 



60—90 cm altis. 



— — — X. sfenocephala (species nonnihil recedens in stirpe 



X. guianensis) — — p. 49. 



+ + Humiles, foliis haud ultra 12 cm longis, 

 indistincte v. non cartilagineo-marginatis, 

 scapis raro usque 30 cm altis. — — — — 



