140 



In my study of these orchids, I came to the conclusion that 

 both were undescribed. One of them, however, has been recog- 

 nized by Dr. Rydberg as his C. Vreelandii, described from Colo- 

 rado. My failure to discover this was owing to the fact that by 

 some mischance I overlooked his description, though I had it 

 by me. 



Corallorhiza Vreelandii Rydberg * 



The following account of the living plant will be useful : 

 Flowering stems 25 cm. high or less, with about 32 flowers 

 or fewer : ovary 10-12 mm. long, about 4 mm. broad : peduncle 

 extremely short : perianth directed forwards, not at all spread- 

 ing, the whole inflorescence pale pinkish-yellow ; sepals 3.5 

 mm. at base, gradually tapering to the apex, 9 mm. long, with 

 four rather indistinct suffused longitudinal reddish stripes ; petals 

 similar but broad-lanceolate, about 8 mm. long, and 4 mm. 

 broad in middle, rather obtuse, with three reddish stripes, 

 stronger than those on the sepals ; lip entire, ovate, the margins 

 involuted, forming conspicuous marginal elevations at the base, 

 below the column ; in the middle line of the lip, at the bend, be- 

 low the stigma, is a prominent swelling, inclined to be longitudi- 

 nally bilobed ; lip with three dark purplish-red longitudinal 

 bands, meeting at the apex : column curved, light yellow at 

 end : pollinia 4, orange ; no spur. 



Corallorhiza Grabhami sp. nov. 



Stems about 40 cm. high, smooth and red : flowering spikes 

 short, about 70 mm. long : sepals dark purplish-red, becoming pale 

 at base, about 8 mm. long and 2.5 mm. broad ; petals purplish- 

 red at apex, and spotted with the same color within and at sides ; 

 column spotted or streaked ; lip white with reddish-purple spots, 

 but no streaks, lip shaped as in C. CorallorJiiza, with small lat- 

 eral lobes, but apical margin much wrinkled and crenulate and 

 basal half with two strong elevated keels. 



Allied to C. multiflora, but easily separated by the form of the 

 lip. 



C. Vreelandii was infested by an aphid, MacrosipJium corallo- 

 rhizae (Ckll.). Dr. Grabham collected two other species of 

 orchids at Pecos, namely Cypripediwm Veganum Ckll. & 

 Barker (unusually large), and Limnorchis viridiflora (Cham.) 



* Bull. Torrey Club. 28 : 271. My. 1901. 



