316 COMPOSITiE. Lepachys. 



scales of the involucre very few, subulate ; the interior much shorter, resem- 

 bUn!:^ the chafT of the receptacle. Rays linear-oblong, yellow. Chaff with 

 a bright purple spot near each margin. Achenia (immature) flat, oval, 

 2-win"fed; the inner wing broader, and more conspicuously fringed with 

 stout ^preadhig bristles ; the summit produced into 2 sharp slightly unequal 

 teeth or awns, which are fully half the length of the corolla, and confluent 

 with the wings, in the manner of Silphium. 



93. DRACOPIS. Cass. diet. 35. p. 273 ; DC. prodr. 5. p. 558. 



Heads many-flowered ; the ray-flowers neutral, in a single series ; those 

 of the disk tubular, perfect. Scales of the involucre in 2 series ; the exterior 

 6-8, small, linear, spreading; the interior very small, appressed, resembling 

 the chaff of the receptacle. Receptacle cylindrical, pointed ; the chaff Hnear, 

 somewhat bearded at the summit, abruptly mucronulate, rather shorter than 

 the flowers. Corolla of the disk with a manifest tube ; the throat expanded, 

 5-toothed, the teetli reflexed. Branches of the style terminated by a linear- 

 lanceolate barbellate appendage. Achenia terete, narrowed towards the 

 base, with a lateral areola, minutely striate and granulated. Pappus obso- 

 lete (an extremely minute entire crown or border), or none. — An annual 

 branching glabrous herb ; the stem and branches striate-sulcate. Cauline 

 leaves cordate-clasping, oblong or oval, mostly acute, entire, the lower ones 

 serrate, smooth and pale, reticulate-veined ; the margins ciliate-scabrous. 

 Heads solitary, peduncled, terminating the branches. Rays yellow, often 

 with an orange-brown spot at the base. Disk (at first somewhat conical, at 

 length cylindrical) fuscous. 



D. amplexicauUs (Cass. 1. c.)—Hook. hot. mag. t. 3716, Sf compan. 1. 

 p. 99. Rudbeckia amplexicaulis, VahU in act. Hafn. 2. p. 29, t. 4 ; 

 Schkuhr, handb. 3. t. 259. R. amplexifolia, Jacq. ic. rar. 3. t. 592 ; 

 Willd. ! spec. 3. p. 2249 ; Pursh ! fl. 2. p. 573. " R. perfoliata, Cav. ic. 3. 

 p. 27, t. 252." R. spalhulata, Nutt. gen. 2 p. 178, ex Muhl. herb.! 



Low prairies, &c., Louisiana! Arkansas! and Texas ! (Also in Mexico 

 according to Cavanilles.) May-Aug.— Stem 1-3 feet high. Rays cunei- 

 form-oblong, 2-3-toothed, 6-10 lines long. Disk at length about an inch 

 long. Anthers fuscous. Branches of the style purple. 



94. GYMNOPSLS. DC. prodr. 5. p. 561. 



Gymnolomia, H. B. <^ K. — Aldama, Lallav. cf- Lex. 7 



Heads many-flowered ; the ray-flowers in a single series, neutral ; those 

 of the disk tubular, perfect. Scales of the involucre in a double series, the 

 exterior somewhat foliaceous. Receptacle flat or convex, or perhaps conical, 

 chaffy. Branches of the style with long appendages. Achenia crowned 

 with a very short coroniform-toothed pappus. — Herbaceous or somewhat 

 shrubby (American) plants, with opposite petioled 3-nerved or triplinerved 

 leaves. Heads pedunculate. DC. 



1. Q. uniserialis (Hook.) : stem erect, scabrous, branching, somewhat 

 dichotomous; leaves obloug-ovate, petioled, angulate-toothed, obsoletely 



