1958] 



THE BOTANY OF THE GUAYAXA HIGHLAND PART III 



105 



eeiliate. Stamens slightly to markedly anisomorphie, the larger antesepaler. 

 Anthers linear-subulate, arcuate, 1-pored ; connective prolonged below the thecae 

 into a bilobed ventral appendage, with a dorsal caudal appendage on the con- 

 nective between the thecae and filament insertion. Ovary free, 4-loeular, multi- 

 ovulate, glabrous or apically puberulous or setose ; style thin, long-exserted ; 

 stigma punctiform. Fruit capsular, the hypanthium smooth or 8-costate ; capsule 

 4-locular; seeds cochleate, strongly muriculate. 

 Generotype : P. coriaceum DC. 



Key to the Species of Pachyloma 



Leaf-surfaces glabrous; apex of the ovary glabrous (rarely sparsely puberulous). 



Leaf -margins strongly inerassate; leaves notably 5-nerved. 1. P. coriaceum. 



Leaf-margins not thickened; leaves mostly 3-nerved, occasionally faintly 5-nerved. 



2. P. huberioides. 



Leaf-surfaces conspicuously glandular-setulose; apex of the ovary densely coronate- 



setulose with long glandulif erous hairs. 3. P. setosum. 



1. Pachyloma coriaceum DC. Prodr. 3: 123. 1828. 



P. coriaceum var. a glaberrima DC. Prodr. 3: 123. 1828. 



P. coriaceum var. /3 subsetosum DC. Prodr. 3: 123. 1828. 



Rhexia pachyloma Schr. & Mart, ex DC. Prodr. 3: 123. 1828. Nomen. 



Rhexia bicuspis Schr. & Mart, ex DC. Prodr. 3: 123. 1828. Nomen. 



Rhexia amazonum Schr. & Mart, ex DC. Prodr. 3: 123. 1828. Nomen. 



Heteronoma pachyloma Mart. Nov. Gen. Sp. 3: HO. pi. 273. 1829. 



Shrub, the terete to obscurely quadrangular branches glabrous. Petioles 3-10 

 mm, glabrous; leaf-blade 5-10 X 2-5.5 cm, oval to ovate-oval, the apex short- 

 acuminate, the base rounded to subcordate, the margins notably inerassate and 

 recurved, entire or evanescently serrulate, 5-nerved, the nerves narrowly im- 

 pressed above and prominulous-incrassate below, the secondary nervation nar- 

 row and rather obscure, obscurely punctate beneath at maturity, glabrous. 

 Pedicels 0-12 mm below the bracteoles, 1-3 mm above, the early-caducous bract- 

 eoles oblanceolate and 1-3 X 0.5-1 mm. Hypanthium (6-) 8-11 mm long, long- 

 cam pan ulate, the fleshy deltoid to rounded calyx-lobes 0.5-1 mm long. Petals 

 15-20 X 8-9 mm, ovate to elliptic, short-acuminate, seto-mucronulate. Stamens 

 glabrous, the filaments 7.5-11.5 mm long antesepalous stamens with thecae 10-12 

 mm long, the connective prolonged 0.6-3.5 mm to the filament insertion, the ven- 

 tral acute spurs 0.2-0.5 mm long, the dorsal seta 1.8-2.2 mm long; alternisepal- 

 ous stamens with thecae 9.5-11.5 mm long, the connective prolonged 0.4-0.7 

 mm to the filament insertion, the ventral acute spurs 0.6-1 mm long, the dorsal 

 seta 1-1.4 mm long. Style 16-17 mm long, glabrous or sparsely glandular- 

 setulose ; ovary glabrous. 



Type Collections: Marlins $. n. "Prov. E. Negro" (M, holotype of P. coriaceum and 

 Uhexia pachyloma)', Martins s. n. "Prov. Para" (M, holotype of P. coriaceum var. glaber- 

 rima and Rhexia bicuspis) ; Martins s. n. 1 1 Ararocoara " (M, holotype of P. coriaceum var. 

 subsetosa and Rhexia amazonum) . 



n. T. spruceana (Maguire, Wurdack, $ Bunting 36136), X 1 ; o, T. aspera (Maguire 4" Maguire 

 40461), X 1; P, T. fraterna {Maguire Fanshaive 32508), X 1 ; Q, T. dissitifiora (Maguire, 

 Wurdack, $ . Bunting 37053), X 1; r, T. duidae (Cowan $ Wurdack 31202), X 1 ; s, T. 

 sipapoana (Maguire 4' Politi 28466), X 2. 



