

5^ Bcilragc ziir Flora vun Mrika. XNIII 



spelze nicht die Zuspitzung wic bei Chacthnn zeigt, (lass die Spolzeii zarlcr 

 sind. Der Habitus ist bei beiden Gatlungen redil verschieden, und die 

 langen, im obcren Ende durcheinander gewirrten (irannen geben Acnio- 



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chaete ein ei2:entumliches Aussehen. 



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A. Yolkensii Pilgcr n. sp.; culmo tenuij parte inferiore (Iccumbcnle 

 ibique ox nodis nonnunquam mdicante et fere ex omnibus nodis ranios 

 lenuesj erectos, floriferos edente, glaberrinio, laevi, slrialo, vaginis quam 

 inteniodia plerumque multo brevioribiis; foliorum lamina tenui, (lexiU, sine- 

 liuscule erecta, lanccolataj apicem versus sensim angustata, longc selaceo- 

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

 brevein altamen bene dislinctum angustata, lamina glabriuscula vel 

 setulis minimis, albidis inspersa et insuper setis nonnullis longioriljus albidis 

 imprimis prope marginem inspersa, marginc scabra, costa slraminea in 

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

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

 firma, brevi, rolundato-oblusa; foliis apicem ramorum erectorum versus 

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

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

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

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

 libus; rhachi racemorum spicularum laliludine angustiore, glabra, spiculis 

 secundis singulis, densius distiche imbricatis; pedicellis imprimis versus 

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

 cavatis; spicula cum pedicello articulata, albido-glauccscentc, anguste Ian- 

 ceolata, acuta; glumis vacuis 3; prima minima vel saepe fere nulla, encrvi, 

 Iruncata, 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 aequantc, marginibus inflexis spiculam amplectente, margine de- 

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

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

 ilorifcra firmiore quam vacuae, tenne cbartacea, fere omnino decolore, 

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

 viridi superne satis prominula, nervis duobus ulroque latere approximatis; 

 palea fere ae^jue lata et longa, tenuiore, acuta, marginibus inflexis, tenuiter 

 2"carinata; flore hermapbrodito; staminibus 3, filamentis brevibus, antheris 

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

 stilis 2 basi connatis, stigmatibus albidis phimosis stilum aequantibus; lodi- 

 culis 2 apice truncatis. 



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