18 CONTRIBUTIONS FEOM THE NATIONAL HERBARIUM. 



Anthers opening by pores 29. POLYGALALES (p. 390). 



Filaments distinct. 

 Anthers opening by pores. 



(Families of) 39. ERICALES (p. 486). 

 Anthers opening by slits. 



Stigmas and styles distinct and cleft, or foliaceous, or united 



by pairs 30. EUPHORBIALES (p. 392). 



Stigmas or styles all distinct or all united, neither cleft nor 

 foliaceous. 



Stamens 2 42. OLEALES (p. 495). 



Stamens more than 2. 

 Ovules 2 or more in each carpel. 



34. HYPERICALES (p. 427). 

 Ovules solitary in each carpel. 



(Families of) 28. GERANIALES (p. 379). 



ANNOTATED CATALOGUE. 



Subkingdom PTERIDOPHYTA. 



Order 1. FILICALES. 



1. POLYPODIACEAE. Fern Family. 



The only family of the order in New Mexico. 



Notwithstanding the dryness of the climate, New Mexico has a considerable number 

 of true ferns. With one exception they grow in the mountains. Most of the species 

 occur in crevices or under overhanging rocks in the drier and warmer mountain ranges. 

 A few of the more delicate ones live only in moist, cool forests in rich soil. A few 

 others occur on high mountain peaks. 



KEY TO THE GENERA. 



Mature sori round or little elongated, appearing as sepa- 

 rate small dots on the back of the frond. 

 Fronds once pinnate or pinnatifid, having few large 

 pinnae. 

 Sori furnished with an indusium ; leaf margins 



spinulose 10. Phanerophlebia (p. 26). 



Sori naked; leaf margins not spinulose 13. Polypoditjm (p. 27). 



Fronds mostly twice pinnate or pinnatifid, having 

 many small pinnules 1 cm. long or less. 

 Indusium superior, cordate or reniform, fixed 



at the sinus 9. Dryopteris (p. 25). 



Indusium inferior or lateral. 



Indusium inferior, breaking at maturity 



into stellate lobes 12. Woodsia (p. 26). 



Indusium lateral, thrown back at maturity 



as a delicate hood 11. Filix (p. 26). 



Mature sori elongated, oblong to linear, mostly con- 

 fluent. 

 Sori naked. 



Sori scattered on the back of the frond, follow- 

 ing the course of the veins, branching 1. Bommeria (p. 19). 



Sori marginal, near the ends of the veins, some- 

 times covered at first by the reflexed 

 edges of the pinnae 2. Notholaena (p. 19), 



