60 ALB. NILSSON, STUDIEN UBER DIE XYEIDEEN. 



min. la,ta, bracteis obovatis, coriaceis, punctatis, feiTugineis, concoloribus vel dorso area 

 parva indistincta notatis, margine subintegris, apice pilosulis; sejjala lateralia navicularia 

 lanceolata, a;quilatera, bracteis sublongiora, 8 — 9 mm. longa, ima basi postice connata, 

 carinata, carina alata, ala superne pilosa; capsula elliptica apiculata, sepalis lateralibus 

 Vi brevior. 



Icon. Tab. 4, fig. 2, 2 a — d. 



Hab. Brasilien: Minas Geraes in palustribus Serra do ('araca (Martius in herb. 



Monac). 



104. XyriS longifolia Maetius 1841 (char. emend.) 



in Beiblatt zur Flora, Jabrg. 24, Band 2, pag. 54. 



Descr. (Secundum specimina originalia manca Maetii). Folia plana, anguste lineari- 

 lanceolata, striata, glabra, nervö marginal! incrassato, margine ipso attenuato, 40 cm. longa, 

 8 — 10 mm. lata, V4 complicata, parte complicata castanea, nitida; scapus inferne teretiusculus, 

 sursum anceps marginibus acutis, glaber, circiter 50 cm. longus, basi vagina apice brevi- 

 foliato 25 cm. longa instructus; spica ovato-globosa, 14 mm. longa, usque 10 mm. lata, 

 bracteis ovatis ferrugineis, opacis, punctatis, dorso area apicali ovata notatis, margine 

 integris, breviter ciliatis; sepala lateralia tequilatera, lanceolata, 6 mm. longa, carinata, 

 carina alata, ala lacerata; staminodia penicillata; capsiila ignota. An hujus sectionis? 



Hab. Brasilien: Säo Paulo in campis altis ad Yta et Sorocaba (Martius in herb. 

 Monac). 



Von Xyris rigidn. Kunth, zu welcher diese Art von Seubert in Flora brasiliensis, 

 fasc. 15, pag. 220, als Synonym hingefuhrt wcirden, ist sie sehr verschieden. Die Aehre 

 erinnert etwas an Xyris macrocephala Vahl, aber die Blätter sind ganz verschieden. Ob 

 sie wirklich zur Sectio Nematopus gehöre, muss ich unentschieden lassen. 



105. Xyris nigricans Alb. Nilsson n. sp. 



Descr. Folia evidenter disticha, plana, linearia, apice obliqua, obtusa, 25 — 35 cm. 

 longa, 3 — 4 mm. lata, glabra, margine sajpius fuscescentia, ciliata, ^1.^ — ^3 complicata, 

 basi ampliata, fuscescentia, margine complicationis glabro; scapus obtusiusculo-triqueter, 

 glaber vel margine prominente hispidulo, 65 — 75 cm. longus, basi vagina aphylla, 25 — 30 

 cm. longa instructus; spica globosa vel depresso-globosa, 15 mm. longa, bracteis exteriori- 

 bus 20 — 30 sterilibus, extimis a basi lata anguste lanceolatis, acuminatis, 13 — 15 mm. 

 longis, sequentibus late lanceolatis acuminatis, omnibus nigricantibus margine pallidiore, 

 bracteis fertilibus lanceolatis vel late lanceolatis, 8 — 11 mm. longis, basin versus fusco- 

 flavescentibus; sepala lateralia lanceolata, asquilatera, stepius plus minus curvata, 7 — 9 

 mm. longa, bracteis subaäquilonga, carinata, carina alata, ala glabriuscula; stamina antheris 

 ellipticis latitudine subtriplo longioribus, connexivo latiusculo; staminodia bibrachiata, 

 brachiis penicillatis, staminibus paulo brevioribus; capjsula obovata sepalum dimidium 

 a^quans; semina nigra, ellipsoidea, longitudinaliter costata. 



