a. Involucral bracts very hard and conspicuously reticulate. 



a 1 Infi, cyathiform (dilated at the top), entirely red as are the flowers 



subulate staminodes H. scyphifera. 



b' Infi, fusiform not or very little dilated at the top. 



a 2 Rhizome elevate on large supraterraneous roots. Bracts without 

 pungent spines. Flowers yellow or orange or dark red: H '.Pininga. 

 b 2 Rhizome creeping along the ground, or a little elevated. Bracts 

 very rough and hairy when fresh. Bracts terminated by erect, 

 pungent spines. No bracteoles. No staminodes. Stamen petaloid. 

 Lip without auricles H. tomentosa (villosa). 



b. Involucral bracts not or not conspicuously reticulate, whitish silky 

 with a glabrous red tip. Flowers dark red, slender. 



a' Spikes large ovate many-flowered at the top. Tomentum of the 

 bract joined without pores, upper '/i part of the bracts glabrous red. 

 Flowers slender. Calyx not surpassing '/ 2 of coroll-tube. Horn- 

 shaped staminodes at base of stamen H. paludosa. 



b' Spikes fusiform. Bracts almost wholly covered with a joined very 

 thin whitish tomentum more or less densely conspersed with 

 small transverse exsculpted pores Edges glabrous, red. Flowers very 

 large (120 mm.). Limb about (?) long. Calyx about 3 / 5 of coroll-tube. 

 B. Connective not or very little longer than the anther with a fleshy more 

 or less recurved bilobed margin no flat entire crest on the anther. 

 Thecae not prolonged at the base, no staminodes at the base of the lip. 

 Lip calciform, auricles erect or a little convolute, not reflexed. Indûment 

 floccose. 



a. Spikes on long straight loosely braçteate erect peduncles 100 — 

 500 mm. tall. 



a' Bracts quite smooth, glabrous, brownish red, marcescent at the 



top, flowers dark red H. mollis. 



b 1 Bracts longitudinally ribbed, and reticulate by means of interposed 



hairtufts, whitish tinged red near the margin. 



a 2 Scapes surpassing 300 mm. Flowers white petals converging 

 around the anther, pale red, lip rather longer than petals, pale 

 yellow; anther half way adnate to the lip, very long, auricles 

 of the lip crenate or with a dentiform process. Ligula and 

 petiole glabrous //. elongata. 



b 2 Scapes varying from 100—400 mm. Flowers pale red, anterior 

 petals placed below the lip, not converging with the dorsal lip. 

 Lip calciform with short auricles, rather fleshy, not much longer 

 than petals. Ligula and petiole villous . . . . H. Rumphii, 



b. Peduncles shorter than spikes or as long, often curved, subterraneous. 

 a 1 Spikes fusiforrrç. Bracts red and whitish, tufted. Labellum calciform 



or linguiform. 



a 2 Indûment tomentose smooth and joined in the centre, loosely 

 tufted near the top and margins. Flowers dark red. 



