166 LEAFLETS. 



A rather small, and small-leaved Texan species, only one to 

 two feet high, therefore of the size of A. alSum, but singu- 

 larly upright and strict, and therein most unlike that, which 

 is lax and spreading. The best specimens were collected by 

 Reverchon, at Estelline, on the North Fork of the Red River, 

 Texas, in May and July, 1904, and distributed by B. F. Bush. 

 A good specimen of the same was collected at Canadian, in the 

 same general region, by Arthur H. Howell, in July, 1903. 



ApoCYisruM ISOPHYLLUM. Allied to A. cannabinum and as 

 bushily branched, the branches even longer, the whole herbage 

 of a peculiarly intense green, but not dark, glabrous, only the 

 lower face of foliage glaucescent ; branches suberect, long, very 

 leafy and the leaves small, suberect, about 1/:^ or 1% inches 

 long, the lowest not larger than the uppermost and all of one 

 size, oblong-oval, short-petiolate, obtuse at both ends, more so 

 at apex and abruptly and stoutly mucronate, upper face not 

 marked by conspicuous venation, the lower showing filiform 

 but clearly elevated feather veins, these not in the least 

 whitened, but green as the rest of the organ ; cymes very 

 many, small and few-flowered, everywhere subsessile and sur- 

 passed by foliage ; sepals lanceolate, short, not reaching the 

 sinuses of the small short-cylindric green corolla. 



Plant known only in one good specimen collected by myself 

 in the open prairie near Notre Dame, Indiana, 24 July, 1899. 

 I saw in it at the time a near ally of A. cannabinum and with 

 green flowers like that, but it has plenty of marks by which 

 to distinguish it. The foliage being not only copious, and of 

 the same size on all the parts, is so small that it might have 

 been well named from that character. 



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Apocynum PLATYPHYLI.UM. Robust and tall, commonly 4 

 feet high, stem and branches deep-green without trace of 

 bloom or pallor and glabrous, so also the upper face of the , 



foliage, except as marked by a distinct though not broad « 



whitish midvein and numerous finer and almost divaricate 



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