1953] 



BOTANY OF THE GUAYANA HIGHLAND 



119 



Phaseolus adenanthus Mey. var. adenanthus. 



Vine with pale purple flowers, North Mountain, Cerro Sipapo, January 25, 

 1949, Maguire & Politi 28605. The species is widely distributed in South Amer- 

 ica but this variety has been recorded previously only from Colombia, Ecuador, 

 and Surinam. 



RUTACEAE 



Apocaulon Cowan, gen. nov. 



Herba acaulescens; folia radicalia, composita; inflorescentia racemus dicho- 

 tomus; calyx quinquelobatus, lobi inaequales; corolla tubuliformis quinquelobata, 

 lobi duo abaxiales superius juncti in labium bilobatum; stamina quinque, antheris 

 duobus fertilibus se adspicientibus forte cohaerentibus, antheris basi flabello 

 conspicuo ornatis, filamentis inferne liberis juxta antheram corolla adhaerenti- 

 bus; discus cupuliformis, aequilateralis; ovarium e carpellis quinque in stylum 

 basaliter alatum junctis, stigmate quinquelobato; fructus e mericarpiis uno ad 

 quinque, singulatim semen unicum gignentibus. 



Apocaulon carnosum Cowan, sp. nov. 



Axis erectus, 3-4 mm. diametro; planta omnino pilis multis resinosis vestita 

 (floribus exceptis) appresso-puberula; folia trifoliolata, foliola ovalia ad suborbi- 

 culata, membranacea quando sicca, carnosa quando recentia, supra atroviridia 

 infra virido-alba venis pilis multis appressis et areolis inter venas pilis multis 

 resinosis brevioribus, marginibus integris et densissime ciliatis, basis folioli 

 extremi aequilateralia et obtusa ad acutam, foliolorum lateralium inaequilateralis 

 et obtusa ad acutam, apices acuti ad subobtusos, foliola lateralia 2-3.3 x 1.5-2.5 

 cm., foliolum extremum 4-7.5 x 3-4 cm., petiolulis 3-13 mm. longis, petiolus 6-12 

 cm. longus, teres, carnosus; inflorescentiae 11-19 cm. longae, pedunculis 9-14.5 

 cm. longis, rami quaque 2-4.5 cm. longi, pedicellis filiformibus, 0.5-2.5 mm. lon- 

 gis, a bracteis minutulis subtentis; calyx lobis brevissime cohaerentibus, inae- 

 qualibus, linearibus, rectis vel leviter patentibus, in fructo persistentibus et non- 

 nihil accrescentibus, ad apices obtusis, extus hispidulis, intus lobis adaxialibus 

 exceptis puberulis, marginibus integris et densius ciliolatis; duobus adaxialibus 

 1 x 0.5 mm., uno abaxiali 1.5 x 0.5 mm., duobus lateralibus 2,5-4 x 0.5-0.7 mm.; 

 corolla alba, 3.5-6.2 mm. longa, tubuliformis, curva, tuba ad basim glabra, ad 

 apicem pilis deflectis, 1.5-3 mm. longa (labium lobis altius junctis), lobis forte 

 imbricatis, oblongis vel ovalibus (labii lobis angustioribus), subconcavis, ad 

 apicem obt.isis et hispidulis, reliqua parte flexuoso-puberul*s; staminum ferti- 

 lium antherae rectae, glanduloso-puberulae et in dorso hispidulae, ellipticae, 

 basifixae, 1 x 0.5-0.7 mm., ad basim appendicibus flabelliformibus undulatis 

 circa 0.5 x 0.5 mm. ornatae, filamentis ligulatis, 2-3.3 x 0.3-0.6 mm., pollinorum 

 grana 55 x 45 micra, subglobosa, superficie levi, forte alveolata; staminodia 

 subulata, 1.5-6.5 mm. longa, unum vel duo longiora et uncinata, filamentis ligu- 

 latis 0.3 mm. latis, filamentis omnibus infra liberis, juxta corollae fauces adhae- 

 rentibus, loco adhaerentiae densius lanulatis; discus plus minusve quinqueloba- 

 tus, truncatus, ovarium arete circumcludens, 0.4 x 0.5-0.8 mm.; stigma quinquelo- 

 batum, diametro aliquanto modo quam stylus maius; stylus circa 1.2-1.8 mm. lon- 

 gus, columnaris, prope apicem leviter curvus, ad basim quinquealatus; ovarium 

 0.4 x 0.4-0.7 mm., carpello quoque duobus ovulis placenta axili superpositis; 

 mericarpia dorso rostrata ad apicem, 2.5 x 1.5-2 mm., recto-puberula, exocarpio 

 costis parallelibus horizontalibus humilibus, endocarpio albo, dehiscentia ab 

 exocarpio separante; semina 1.5-1.8 x 1.2 mm., nigra, subtuberculata ad tuber- 

 culata, supra hilum rostrata, testa tenui, crustosa, cotyledonibus suborbiculari- 

 bus, radicula brevi robusta. 



