108 



CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Exolobus albomarginatus Pittier, sp. nov. Fiouke 16. 



A low trailing shrub, with erect axillary branchlets. Stems rounded, obscurely 



striate longitudinally and covered with stiff hairs. Branchlets finely pubescent, 15 to 



20 cm. long. 



Leaves opposite, long-petiolate. Petioles pubescent, slender, 4 to 6 cm. lone. 



Leaf blades broadly ovate to lanceolate, acuminate, 4 to 9 cm. long, 2 to 5 cm. broad 



with a deep and wide open 

 basal sinus and rounded 

 auricles; upper face deep 

 green, almost smooth or 

 sparsely hairy, with 4 

 small glands at the base of 

 Ihe main nerve; lower face 

 pale green, pubescent on 

 the prominent, finely anas- 

 tomosed main and second- 

 ary nerves; margin re vo- 

 lute. 



Inflorescences axillary, 

 forming lax, few-flowered 

 panicles. Peduncles pu- 

 bescent (as are also the 

 pedicels), shorter than the 

 petioles. Bractlets subu- 

 late, hairy. Pedicels 

 slender, 2 to 4 cm. long. 

 Sepals lanceolate, acute, 

 about I cm. long, 2.5 to 3 

 mm. broad at base, densely 

 hairy outside, smooth in- 

 side, each alternating with 

 an inside yellow gland. 

 Corolla 4 cm. in diameter, 

 deeply divided into 5 

 lobes, these 4 mm. broad 

 at the base, long (18 mm.), 

 acute, reflexed, pubescent 

 outside, almost smooth in- 

 side, deej) apple-green 

 with darker longitudinal 

 lines and a narrow, pure 

 white margin, the whole 

 turning uniformly brown 

 in desiccation. Outer 

 crown membranous, green, 

 forming 5 obtuse lobes, 

 hairy outside and ciliate 

 on the margin. Inner 

 crown dark purple, 

 slightly higher than the 

 outer one, with an inwardly recurved, beak-like tooth opposed to each lobe of the 

 former and united to the gynoetegium by a thin, vertical membrane. Appendages of 

 the anthers 2-lobate, rather broad, pendulous. Retinaculum about 0.28 mm. long; 



Fig. lfi.— Parts of Exolobus albomarginatus. a, Leaf; b, ilower; c, 

 crown; d, gynostegium from above; e , Iranslutorium. a, b, Natural 

 size; c, scale about . r >; d, scale 8; e, scale 31. 



