56 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I26 



9. Dyckia Schult. f. 



Dyckia Schult. f. in R. & S. Syst. 7, pt. 2: p. Ixv, 1194. 1830. 



Chiefly native of the dry open campos of Brazil with outlying species 

 in Bolivia, Paraguay, Uruguay, and northern Argentina. 



I. Pedicels 20 mm. long or more, much exceeding the floral bracts ; leaves over 



I m. long, repand-serrate with teeth 4 mm. long I. D. pedicellata ^ 



I. Pedicels much less than 20 mm. long. 

 2. Inflorescence densely ferruginous-lepidote, amply tripinnate ; leaves lepidote 

 on both sides; floral bracts not more than 3 mm. long, much exceeded 



by the sepals 2. D. tomentosa ^ 



2. Inflorescence not densely ferruginous-lepidote or else either less than 

 tripinnate or the leaves glabrous above or the floral bracts more than 

 3 mm. long. 

 3. Filaments free above the common tube formed by the petals and stamens 

 together. (Fig. 15.) To p. 59. 

 4. Floral bracts not more than 3 mm. long, exceeding the pedicels ; in- 

 florescence ample, 2-3-pinnate; sepals 5 mm. long or less. 

 5. Leaves densely lepidote ; inflorescence completely glabrous ; flowers 

 dimorphic ; sepals apiculate 3. D. selloa 



5. Leaves nearly glabrous on both sides ; inflorescence densely tomen- 



tose-lepidote ; flowers all perfect; sepals acute 4. D. maritima 



4. Floral bracts much more than 3 mm. long, or shorter than the pedicels 

 {Dyckia orobanchoides) ; inflorescence simple or bipinnate. 



6. Stamens distinctly exceeding the petals ; floral bracts exceeding 



the pedicels. 

 7. Floral bracts broadly ovate or suborbicular, apiculate. 

 8. Racemes dense; sepals 3-4 mm. long; style nearly the same 



length as the ovary 5. D. microcalyx 



8. Racemes lax; sepals 6-10 mm. long; style much shorter than 



the ovary. (Fig. 14.) 6. D. leptostachya 



7. Floral bracts ovate, acuminate ; inflorescence simple, few-flowered ; 



sepals 6-7 mm. long 7. D. tenuis 



6. Stamens equaling the petals or shorter, or the floral bracts shorter 

 than the pedicels. 

 9. Sepals acute, subacute, or apiculate. To p. 58. 



10. Inflorescence densely ferruginous-tomentose or ferruginous- 



lanate, simple to much branched; scape-bracts serrulate. 



II. Margins of the sepals obscured by the dense lanate indument; 



petals barely exceeding the is-mm.-long sepals; floral 



bracts entire; leaf -blades glabrous, the spines 3 mm. long. 



8. D. ursina 

 II. Margins of the sepals clearly visible; petals greatly exceed- 

 ing the 8 mm. long sepals ; floral bracts serrulate ; leaf- 

 blades lepidote beneath, the spines 3-5 mm. long. (Fig. 15.) 



9. D. encholirioides 

 10. Inflorescence pale-lepidote or pale-villous or glabrous; usually 

 simple. 



^ Dyckia pedicellata and D. tomentosa are known from fruiting material only, thus necessi- 

 tating the artificial treatment given above. It is not even wholly certain that they belong 

 to the genus Dyckia. 



