NOTES ON TRILLIUM 323 



namely, the larger lanceolate strongly trinerved leaves with tapering 

 tips — disappears on reference to the specimen. It is of interest to 

 note apropos of this discrepancy that J. E. Smith, who erroneously 

 referred Catesby's other specimen (T. Cateshal Elliot) to T. ceniuum 

 L., remarks: "Icon Catesbseana tarn informis, atque colore tarn 

 erronea est, ut earn ad nostram speciem pertinere, nisi herbarium 

 auctoris in Museo Britannico inspexissem, minime crediderim ; rara 

 pulchraque htec planta meliorem sane postulat" {Spicileg.Botan.4). 

 Dr. J. K. Small, in a review of the " Sessile-flowered Trillia of 

 the South-eastern States" (Bull. Torr. Bot. CI. xxiv. 169), protests 

 against the inclusion of many widely differing forms under a single 

 name, and distributes under six species the varieties included by 

 Watson ("Revision of North American Liliaceae " in Proc. Am. 

 Acad. xiv. 273) under 2\ sessile L. and 2\ recurvatum Beck. Dr. 

 Britton had previously consulted my colleague Mr. E. G. Baker as 

 to the identity of the Grouovian and Plukenet plants. Dr. Small, 

 impressed with the dissimilarity between these and Catesby's figure, 

 writes : " Thus we see that the first and second quoted descriptions 

 in the Species Plantarum are represented by specimens which agree 

 with each other in all essential particulars, while the third quotation 

 is founded wholly on a plate which represents a species totally 

 distinct from that on which the first and second descriptions were 

 founded. Therefore the name Trillium sessile must be associated 

 with the small oval-leaved plant, and the large plant must receive 

 a name." The name given is T. Under ivoodii. The writer states 

 that the two species " are remarkably constant in comparative size," 

 and " can readily be segregated on size and habit alone, and of 

 course comparative measurements of organs would serve as an 

 excellent basis of separation. But this is not necessary, since we 

 have such good specific characters as exist in the flower, especially as 

 respects the stamens and styles." The distinctive characters as 

 given by Dr. Small are — 



T. sessile. T. Underwoodii. 



Rootstock ovate or ascending, Rootstock horizontal. 



corm-like. 

 Stem 1-2 dm. tall, slender. Stem 1-3 dm. tall, stout. 



Leaves oval or suborbicular, 4-8 Leaves varying from ovate-lanceo- 



cm. long, obtuse or acute, late to ovate-orbicular, 8-18 cm. 



rounded at the base, 3-5- long, acute or short acuminate, 



nerved, not mottled. rounded or subcordate at the 



base, mottled. 

 Sepals 2-3 cm. long, acute or Sepals 4'5-5-5 cm. long, obtuse 



acutish. or acute. 



Petals narrowly elliptic, slightly Petals lanceolate, elliptic or ob- 



shorter than or longer than lanceolate, 5-5-8-5 cm. long. 



the sepals. 

 Stamens about half as long as Stamens 3-4 times shorter than 



the petals. the petals. 



Filaments dilated at the base, Filaments very short, anthers 



-|— I shorter than the anthers. 1*5-2 cm. long, subsessile. 



Styles elongated, nearly straight. Styles almost wanting, stigmas 



recurved. 



2 A 2 



