38 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I26 



• Subfamily i. pitcairnioideae 



I. Seeds appendaged ; sepals convolute with the left side of each overlapping 

 the right of the next one (except in Brocchinia). 

 2. Petals free; filaments not forming a tube; flowers always perfect. 

 3. Ovary wholly superior. 

 4. Petals naked ; herbs. 

 5. Seeds broad, with a wing surrounding at least three sides; plants 

 usually large and coarse. 

 6. Petals broad, much more conspicuous than the sepals, strongly 

 twisted together after anthesis ; seed-wing little if at all pro- 

 duced. (Fig. I.) I. Puya 



6. Petals narrow, inconspicuous ; seed-wing produced dorsally. (Figs. 



2, 3.) 2. Encholirium 



5. Seeds narrow, caudate-appendaged or apiculate at each pole; petals 

 not twisted together after anthesis. 



7. Seeds or ovules merely apiculate; placentae basal. (Fig. 4.) 



3. Cottendorfia 

 7. Seeds long-caudate ; placentae usually extending almost the height 

 of the cell. 

 8. Petals white, separate after anthesis ; sepals not over 5 mm. 



long, thin, flat; plants slender. (Fig. 5.) 4. Lindmania 



8. Petals brightly colored, more or less massed together after 

 anthesis but not twisted; sepals larger and firmer; plants 



relatively robust. (Fig. 6.) 5. Connellia 



4. Petals each bearing a single large scale near the base; spreading 

 shrubs ; scape with a definite cambium layer ; inflorescence panicu- 

 late. (Fig. 7.) 6. Deuterocohnia 



3. Ovary at least partly inferior. 

 9. Flowers large and conspicuous, usually zygomorphic; petals often 

 appendaged, several times as long as the ovary ; ovules numerous. 



(Figs. 8-11.) 7. Pitcairnia 



9. Flowers minute, regular ; petals naked, usually shorter than the ovary ; 



ovules few. (Fig. 12.) 8. Brocchinia 



2. Petals joined centrally to a tube formed by the bases of the filaments but 

 their margins free, yellow or orange; flowers sometimes with one sex 



aborted ; seeds winged. (Figs. 13-20.) 9. Dyckia 



I. Seeds naked; sepals cochlear with both posterior ones overlapping the 

 anterior. (Fig. 21.) 10. Navia 



Subfamily 2. tiixandsioideae 



I. Appendage of the seed basal, straight at maturity. (Fig. 22.) 

 2. Petals free or slightly joined, the corolla-tube then deeply included in the 

 calyx. 

 3. Petals naked; inflorescence of one or more distichous-flowered spikes 

 or rarely simple and polystichous or even one- flowered. (Figs. 22-30.) 



II. Tillandsia 



3. Petals each bearing two scales (or very rarely a single one) on the 



inner face. (Figs. 31-48.) 12. Vriesia 



