257 



MELASTOMACEAE : PTEEOGASTEA. 



258 



2. Folia densiuscule longeqne pilosa; petala obovato-ob- 

 longa; coDnectivnm infra loculos antherarnm longe pro- 

 ductum 3. P. major Triana. 



1. PTEROGASTRA MINOR Naud. caule erecto, gra- 

 cili , glabro , laevi , dichotome sed non divaricatim ramoso ; 

 ramis brevibus; foliis breviter petiolatis, paras, oblongo- 

 ovatis, apice acutis vel subacuminatis , basi subrotundatis, 

 margine ciliolatis, utrinque puberulis, trinerviis; floribus 

 parvis , tetrameris, bibracteolatis; calycis tubo anguste cam- 

 panulato, basi subrotundato, segmentis anguste triangularibus, 

 tubo dimidio brevioribus; petalis late obovatis, apice sub- 

 truncatis vel subemargiuatis ; antheris linearibus, apice bre- 

 viuscule attenuatis, valde arcuatis, majorum connective) infra 

 loculos longiuscule producto; ovario ovoideo, vertice pauci 

 glanduloso- setoso ; capsula quadrivalvi. 



Pterogastra minor Naud.f in Ann. Sc. nat. ser. 3. XII. 

 tab. 15. fig. 8, XIII. 33 et Melast. 98; Triana Melast 40. 



Caults inferne simplex, superne ramosissimus , 1 — V/z dm. altus; 

 rami gracillimi, erecti vel erecto-patuli. Petiolus gracilis, glaber, 1 — 2 mm. 

 longus. Folia patula vel interdum reflexa, internodiis dimidio breviora, 

 1 — l 1 /* cm. longa, 4 — G mm. lata. Pkdicblli filiformes, subrecti, glabri, 

 alares 1 — 2 mm. longi, axillares 1 — 17» cm. longi. Bracteolae sessiles, 

 patulae, ovatae vel oblongae, apice acutae et longiuscule setosae, 2 — 3 mm. 

 longae. Calycjs tubus apice vix constrictus, 6 mm. longus, 4 mm. latus; 

 segmenta erecta, margine breviuscule ciliata, apice acuta, 3 mm. longa, 

 basi l'/a — 2 mm. lata. Petala patula, tennissime multinervia, margine 

 longiuscule ciliata, 8 — 10 mm. longa lataque. STAMINUM filamenta capil- 

 laria, leviter flexuosa, 5 vel 6 mm. longa; antberae majores G mm. longae, 

 1 mm. crassae, connectivo infra loculos 3 mm. longus producto, capillar!, 

 valde arcuatu; antberae minures 3 — &*/% mm. longae, cunnectivu infra lo- 

 culos 1 mm. longos producto, satis arcuato. Stylus subcapillaris, vix ar- 

 cuatus, 12 — 15 mm. longus. Capsula nobis ignota. 



Habitat ad ripas fluminis Orenoco prope Atures : Bonpland. 



2. PTEROGASTRA DIVARICATA Naud. caule erecto 

 vel adscendente, satis gracili, glabro, acute tetragono, secus 

 angulos adpresse strigoso, trichotome et divaricatim ramoso 

 vel ramosissimo; ramis longiusculis , subtetrapteris; foliis 

 breviuscule petiolatis, majusculis, oblongo-lanceolatis vel lan- 

 ceolatis, apice acutis, basi leviter attenuatis, margine breviter 

 ciliolatis, utrinque sparsissime breviterque pilosis, trinerviis, 

 subtus ad nervos adpresso-strigosis ; floribus majusculis, pen- 

 tameris, saepius minute bibracteolatis; calycis tubo oblongo- 

 campanulato, basi breviter attenuate, segmentis triangulari- 

 linearibus, apice longe setosis, tubum subaequantibus ; petalis 

 obovatis, apice rotundatis; antheris lineari-subulatis , apice 

 longiuscule attenuatis, saepius leviter arcuatis, majorum con- 

 nectivo infra loculos breviter producto ; ovario ovoideo-oblongo, 

 vertice multisetoso et non glanduloso; capsula 5-valvi. 



Pterogastra divaricata Naud.f in Ann. Sc. nat. ser. 3. 

 XIII. 33 et Melast. 98- (pro parte); Triana Melast. 40. tab. II. 

 fig. 30 a. 



Bhexia divaricata Bonpl.! Rhex. 59. tab. 22. 



Osbeckia divaricata Spreng. Syst. veget. II. 312. 



Chaetogastra divaricata DC! Prodr. III. 132; Benth. 

 in Hook. Journ. of Bot. II. 290. 



Caulis inferne simplex vel interdum fere usque ad basim satis ra- 

 mosus, pallide viridis vel interdum dilute purpurascens, 4 — 5 dm. altus; 

 rami graciles, pallide virides. Petiolus gracilis, longiuscule denseque ad- 

 presso-setulosus , 3 — 5 mm. longus. Folia patula vel erecto-patula rarius 

 reflexa, internodiis saepius multo breviora, supra laete viridia, subtus vi- 

 ridi-cinerea, 4 — 6 cm. longa, 8 — 16 mm. lata, superiora saepius paulo mi- 

 nora et angustiora; nervis gracilibus, supra leviter impressis, subtus satis 

 prominentibus, mediano paulo crassiore. Pedicelli crassiusculi , recti, 

 glabri, alares 1 — 2 mm. longi, axillares 1 — 2 cm. longi. Bracteolae ca- 

 ducae, sessiles, patulae, lineari-subulatae, hispidae, 1 — 3 mm. longae. 

 Calyx pallide viridis vel interdum flavescens, tubo apice satis constricto, 

 7 — 9 mm. longo, 3 — 4 mm. lato, late 5-alato et distincte 5-nervio, alis 

 crassis, distincte undulato-verruculosis, segmentis erectis, margine densius- 

 cule ciliatis, 5 — 6 mm. longis, basi l^a mm. latis. Petala erecto-patula, 

 basi tennissime multinervia, margine brevissime glanduloso -ciliata, apice 

 apiculata et longiuscule aristata, 10 — 12 mm. longa, 6 — 9 mm. lata. Sta- 

 minum filamenta capillaria, satis flexuosa, 4 — 5 vel 6 — 7 mm. longa; an- 

 tberae majores purpureae, 6 — 7 mm. longae, 1 mm. crassae, connectivo 

 infra loculos l'/a mm. longos producto, capillari, leviter arcuato; antherae 

 minores pallidae, 37a — 4 mm. longae, connectivo infra loculos x fi mm. 

 longos producto, paulo arcuato. Ovarium 2V« — 3 mm. longum, setis pal- 

 lidis, rigidis, 2 mm. longis; stylus purpurascens, capillaris, leviter arcuatus, 

 apice vix incrassatns, 11 — 12 mm. longus. Capsula anguste ovoidea, pal- 

 lide fusca, longitudinaliter 5-sulca et leviter 5-costata, 8 — 9 mm. longa, 

 4 — 5 mm. crassa. Semina fulva, valde cochleata, basi oblique subtruncata, 

 apice rotundata, minutissime et creberrime tuberculata, 2 /s mm. longa, 

 7« mm. crassa. 



Habitat ad flumina Rio Negro, Cassiquiari, Vasiva et Pacimoni: 

 Spruce n. 2972 ; ad Esmeralda in campis vulgata: Spruce; ad ripas Ore- 

 nod prope Maypures : Bonpland. Etiam in Guiana anglica : Schomburgk 

 n. 721. — Floret Decembri — Maio. 



3. PTEROGASTRA MAJOR Triana: caule erecto vel 

 decumbente, robustiusculo, glabro vel sparse setoso, ad nodos 

 densiuscule longeque setoso, acute tetragono, secus angulos 

 adpresse longeque strigoso, superne di-trichotome sed non 

 divaricatim ramoso; ramis elongatis , acute tetragonis; foliis 

 breviter vel breviuscule petiolatis, majusculis, oblongo-lanceo- 

 latis vel lanceolatis, apice acutis, basi rotundatis vel vix 

 attenuatis, margine ciliatis, utrinque subsparse longeque pilosis 

 praecipue supra, subtus ad nervos subadpresse longeque stri- 

 gosis, 3 — 5-uerviis; floribus majusculis , pentameris, minute 

 bibracteolatis; calycis tubo oblongo-campanulato , basi subro- 

 tundato, segmentis anguste triangularibus , apice longiuscule 

 setosis, tubo brevioribus ; petalis obovato-oblongis, apice obtusis ; 

 antheris lineari subulatis, apice longe attenuatis, saepius satis 

 arcuatis, majorum connectivo infra loculos longe producto; 

 ovario oblongo, vertice multisetoso, setis rigidis, apice minute 

 purpureo-glandulosis; capsula 5-valvi. 



Tabula nostra LX (habitus cum analysi). 



Pterogastra major Triana! Melast. 40 tab. II fig. 30b. 

 Pterogastra divaricata Naud.! in Ann. Sc. nat. ser. 3. 

 XIII. 33 et Melast. 98 (pro parte — excl. syn.). 



Caulis inferne simplex, superne saepius satis ramosus, dilute pur- 

 pureus, 6—8 dm. altus; rami satis graciles, pallide virides. Petiolus 

 satis gracilis, longiuscule denseque adpresso-setulosus, 2—8 mm. longus. 

 Folia patula vel erecto-patula, internodiis saepius multo breviora, supra 

 intense viridia, subtus pallide viridia, 4—8 cm. longa, 2— 3'/2 crn. lata, 

 floralia saepius multo minora et angustiora; nervis gracilibus, supra satis 

 impressis, subtus valde prominentibus, mediano paulo crassiore. Pedicelli 

 subfiliformes, recti, sparse adpresso-setulosi, alares 1—2 mm. longi, axil- 

 lares 1—2 cm. longi. Calyx purpureo-fuscus, tubo apice leviter constricto, 

 7 — 8 mm. longo, 4—5 mm. lato, late 5-alato, alis crassiusculis , nun vel 



