513 



above, below sprinkled with pellucid glandules and sparingly his- 

 pidulous on the larger nerves, the margins subciliate. Tlie leaf- 

 lets are somewhat variable in form, but are commonK^ blunter and 

 more obovate-cuneate than those of hirsnta, with broader, less 

 acute teeth, the marginal pattern mostly coarsely crenate-dentate 

 to boldly crenate; sometimes they are throughout narrowly ob- 

 ovate-oblong with broad, shallow, semicrenate teeth ; on the re- 

 duced often trifoliate upper leaves they may be very narrow and 

 sharply dentate-serrate. Interposed leaflets elliptic to obovate, 

 acute, often confined to the distal interspace, usually a small or 

 minute entire pair, occasionally larger and dentate-lobed, rarely 

 with a minute pair on either side. Stipules smaller and narrower 

 than in Jiirsiita, rarely becoming y'i' wide, often very small, lance- 

 olate to semi-cordate, cut-serrate to deeply incised, the lowest of- 

 ten entire. Inflorescence varying from a short terminal raceme 

 to a delicately branched nearly naked loose panicle, the glandu- 

 lose racemes only 3'-6' long and rather loosely flowered. Flowers 

 very small, 2"-3" wide, pale yellow, on slightly spreading pedicels 

 \" or less long; anther-cells contiguous. Bracts minute, ciliolate ; 

 bracteoles ovate, 3-lobed or entire. Flower-buds subglobose, al- 

 most truncate, the sepals ovate-oblong, obtuse, downy-canescent 

 within the apical margins. Mature fruit subspreading or nod- 

 ding, very small, i"-i^" wide, the body subhemispheric, \" long 

 below the marginless rim, pellucid-glandulose, bristles few and 

 weak, short, erect and slightly spreading, equalled or exceeded by 

 the truncate calycular process which caps the very tumid disk ; 

 sulcae rather broad and shallow, 'converging into the narrow and 

 curved stipe-like base. Roots developmg tuberous thickenings 

 which reach a size of 3' X 2"; elongated roots sometimes show two 

 or three successive swellings. (Plate 283, fig. 6.) 



Hilly woodland, mostly in light rich soil; of scattered growth, 

 or forming loose colonies, but never massed in close groups. 



Begins to flower at New York from about the middle to the 

 end of July and continues to bloom into early September. 



This species need be compared only with A. Jiirsiita which, in 

 its stouter forms, it sometimes closely resembles. It differs most 

 obviously in its tuberous roots, lesser size and more slender habit, 

 nearly glabrous stem and branches, delicate short racemes, smaller 

 flowers with obtuse sepals, much smaller hemispheric fruit with 

 unmargined disk and few mostly erect bristles, smaller narrower 

 stipules and more crenate leaves. The leaves, generall}' fewer than 

 in A. Jiirsiita, are more obovate in general outline, the more slender 

 leafstalk rougher below and more narrowly and deeply grooved 

 along the upper side, the leaflets mostly more obversely broadened 



