54 Beiträge zur Flora von Atrika. XMII. 



Spelze nicht die Zuspitzung wie bei Chactiiiin zeigt, dass die Spelzen zarter 

 sind. Der Habitus ist bei beiden Gattungen recht verschieden, und die 

 langen, im oberen Ende durcheinander gewirrten Grannen geben Acrifo- 

 chaete ein eigentümliches Aussehen. 



A. Volkensii Pilger n. sp. ; culmo tenui, parte inferiore decumbenle 

 ibique ex nodis nonnunquam radicante et fere ex omnibus nodis ramos 

 lenues, erectos, floriferos edente, glaberrimo, laevi, strialo, vaginis quam 

 internodia plerumque multo brevioribus; foliorum lamina tenui, flexili, stric- 

 tiuscule erecta, lanceolata, apicem versus sensim angustata, longe setaceo- 

 acuminata, basi in petiolum crassum, puberulum vel glabriusculum, per- 

 brevem attamen bene distinctum angustata, lamina glabriuscula vel ± 

 setulis minimis, albidis inspersa et insupcr setis nonnullis longioribus albidis 

 imprimis prope marginem inspersa, margine scabra, costa straminea in 

 quam confluunt nervi plures, nervis parallelis utroque latere circa 3 im- 

 primis subtus conspicuis, vagina arcta, angusta, striata, glabra, laevi, ligula 

 firma, brevi, rotundato-obtusa; foliis apicem ramorum erectorum versus 

 decrescentibus ; panicula plerumque longius exserta, racemis paucis (2 — 3), 

 distantibus composita vel ad racemum unicum redacta; rhachi tenui, stricta 

 vel parum tlexuosa, glabra, teretiuscula vel racemorum latere sulcata, ra- 

 cemis densifloris, internodiis parum longioribus, erectis, rhachi accumben- 

 tibus; rhachi racemorum spicularum latiludine angustiore, glabra, spiculis 

 secundis singulis, densius distiche imbricatis; pedicellis imprimis versus 

 basin racemi satis longis, teretiusculis, apice band incrassatis, leviter ex- 

 cavatis; spicula cum pedicello articulata, albido-glaucescente, anguste lan- 

 ceolata, acuta; glumis vacuis 3; prima minima vel saepe fere milla, enervi, 

 truncata, secunda angustiore et breviore quam spicula, basi rotundata modo 

 spiculam amplectente, lanceolata, membranacea, margine decolore, setis 

 nonnullis rigidis, albidis dorso instructa, 3-nervia, nervo medio in aristam 

 glumam circa septies superantem abeunte, arista longa apicem versus te- 

 nuissima ibique irregulariter spiraliter torta, basin versus scabra, apicem 

 versus setulis tenuibus irregulariter obsita; gluma tertia latius lanceolata 

 spiculam aequante, marginibus inflexis spiculam amplectente, margine de- 

 colore, dorso setis rigidis, longis, albidis parce inspersa, 3-nervia, e nervo 

 niedio aeque ac gluma secunda sed plerumque paulo brevius aristata; gluma 

 florifera firmiore quam vacuae, tenue chartacea, fere omnino decolore, 

 ovato-lanceolata, acuta, marginibus inflexis, laevi, glabra, nervis 5, costa 

 viridi superne satis prominula, nervis duobus utroque latere approximatis; 

 palea fere aeque lata et longa, tenuiore, acuta, marginibus inflexis, tenuiter 

 2-carinata; flore hermaphrodito; staminibus 3, filamentis brevibus, anlheris 

 crassis, basi sagittatis; ovario anguste ovoideo, deinde fere cylindraceo, 

 stilis 2 basi connatis, stigmatibus albidis plumosis stilum aequautibus; lodi- 

 culis 2 apice truncatis. 



