536 GEOLOGY OF THE BLACK HILLS. 



III. APETAL^l. 



OXYBAPHUS NYCTAGINEUS Sweet. 



Eriogonum multiceps Nees. 



CoMANDRA POLLIDA A. DC. 



Euphorbia margin at a Pursh. 



E. HEXAGONA Nutt. 



Humulus lupulus Linn. 



Abies alba Michx. ? Foliage only. 



MONOCOTYLEDONES. 

 Calochortus nuttallii Torr. & Gray. 



Specimens in flower and with mature fruit. This is noted as an insect- 

 capturing plant, flies having frequently been found fast among the bristles 

 that fringe the gland of the petals, where they had perished. Those who 

 have the advantage of seeing this and similar species alive, either in their 

 native haunts or in cultivation, should learn whether these bristles manifest 

 any irritability. The petals are evidently white or whitish, except the 

 claw and the purple blotch above it. The well-formed mature capsules are 

 2 or 3 inches long, triquetrous-lanceolate, four or five lines in diameter. 

 There is hardly any doubt that Nuttall's Calochortus luteus was correctly 

 referred to this species. Although apparently Wyeth did not obtain mature 

 fruit, Nuttall's description, "capsule linear-oblong, three-sided," and "the 

 capsule much like that of a tulip," suffice to show that his plant ought not to 

 have been referred by Mr. Baker to his section "Platy carpus." The only 

 species of that section likely to be found about the sources of the Columbia 

 is C. nitidus Dougl., to which belongs C. eurycarpits of Watson, and both 

 its ovary and pod are broadly oval in outline. The C. nuttallii of Baker's 

 Revision of Tulipese is evidently made up of more than one species, viz, of 

 Hall and Harbour's 549 (misprinted 529), which is C. gunnisoni, and for the 

 rest probably of C. nitidus. If the specimens cited from Nuttall, Burke, 

 and Bell really belong to C. nuttallii, they cannot have well-formed fruit. 

 The misunderstanding of this latter species accounts for the introduction of. 

 C. leichtlinii Hook. J., Bot. Mag. + 5862, which is plainly our C. nuttallii. 

 Lilium philadelphicum Linn. 

 Prosartes lanuginosa Don. 



