LUNDELL: THE GENUS PARATHESIS 13 
1. Anthers erect, usually dorisfixed near base, never versatile; filaments shorter 
than anthers, commonly one-half as long.......... Series 3-10. 
Series 3-10 
7. Pubescence of branchlets usually coarse and of distinct reddish hairs, 
the hairs dendroid and sessile or stipitate, or the hairs stellate with 
erect and spreading rays, the stellate hairs either sessile, subsessile 
or stipitate; pubescence beneath leaves uniform or sometimes obscurely 
bizonal, sometimes appressed. 
8. Sepals and pedicels papillose-puberulent; the red tomentum of branch- 
lets matted and appearing to be waxy; anthers slender, linear- 
lanceolate, usually adnate and forming a column (Chiapas, Guate- 
male, 1) Salvador). ics) pbs ae 7. P. columnaris. 
8. Sepals and pedicels short hirsute with stellate or branched hairs, these 
often stiff and bristly; the tomentum of branchlets not appearing 
waxy; anthers ovate or lanceolate. 
9. Flowers 5-7 mm. long; sepals usually large, commonly 2-3 mm. long, 
rarely smaller; stamens 3-4 mm. long. 
10. Branchlets conspicuously villous, dendroid hairs long-stipitate, 
shaggy; hairs of costa and lower surface of leaf dendroid, long- 
stipitate and coarse (Tabasco, Guatemala, British Honduras) 
a ee ee a eo 8. P. sessilifolia. 
10. Branchlets not villous, dendroid hairs short-stipitate or sessile 
and branched to base; hairs of costa and lower surface of leaf 
stellate, stipitate, subsessile or sessile, sometimes appressed. 
11. Pedicels 4-12 mm. long, sometimes up to 17 mm. long in 
fruit, often reflexed (Mexico, Chiapas, Guatemala) 
te ree ete ee 9. P. chiapensis. 
11. Pedicels 3-5 mm. long. 
12. Leaves crenulate; flowers at anthesis up to 5.5 mm. long 
(Chiapas, British Honduras)..10. P. rufa. 
12. Leaves coarsely serrate-dentate, the teeth up to 5 mm. 
long (see also P. ferruginea) ; flowers at anthesis up to 
7 mm. long (Nayarit)........ 11. P. prionophylla. 
9. Flowers less than 5 mm. long; sepals small, 1-1.5 mm. long; stamens 
2-2.75 mm. long. 
13. Leaves small, usually less than 10 cm. long; flowers 3.5 mm. 
long at anthesis; anthers usually barbate apically (Hispaniola, 
Cuba). 
14. Petioles 2-6 mm. long; leaf margin remotely denticulate- 
crenulate; inflorescences reduced, up to 3.5 cm. long; 
stamens about 2 mm. long; leaves pubescent beneath with 
rather coarse stipitate or subsessile stellate hairs, the rays 
erect or spreading (Haiti)........ 12. P. parvifolia. 
14. Petioles 5-12 mm. long; leaf margin crenulate; inflorescences 
up to 15 em. long; stamens 2.4-2.75 mm. long; leaves 
pubescent beneath with fine sessile stellate hairs with long 
rays, these spreading or appressed (Hispaniola, Cuba) 
13. P. serrulata. 
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