(!()NTKIUUT1(»NS KUOM THK NATIONAL IlKKHAKll'M. 



iSy'/ (•////( //.v ixiDiiliiid: 



1'k\nsyi,vania: York County, (larhir, May 4, 18t)S. 

 Mauvlaxd: I'luiumcr Islaiul, Uuki]14'}, April I':}, 1807. 



DisTKU T f»K ('oi.imiiia: l-itllc KhIIh, ]'ani'ii, in lH7.'!anil IS?!), I lit;l\ Island, Wnni, 

 in 1S7!>; (irt-at Kails, I'lixrii, in 18HI; lli^rli Islaml, /'«.//(/(•'/•_',"), April (>, IS't'). 

 Tknnks.si:i;: Knnxvillf, limji \'1'.\, April, JMltH; naintf ntation, Kiiinnij. 

 Ki:sri(KY; Near Frankfurt, W'illiiiiiisnii, April, 1S7S. 

 (Miiu: Lancaster, linidinr; near N'ilcs, liK/niliinn, May, ISilJ; Lnrain Cnnnty, 



IHi'hi'irr, Miuvh, iSiM; ('(illaincr, .SA///', April I'O, ISlt'). 

 Indiana: Near Mattsville. ll7/.so» !t, April L"_', iSilL'. 

 Mkiikixn: i'.i'llfvnc, .s7/o(/y(; near Alma, Ihiris, April L".», 1S!»L 

 li.i.isoiM NapfrvilU", rmhurli, April-Muy, IWS. 

 Kansas: l>axti'r Sprin^'H, I'lunk: 



12. OROGENIA WaLsoii, Hot. Ivin«>- Surv. li^o. ls71. 



Citlyx Icctli iiiimitc. Kfiiit ohloiio-, very sliuhtly lliittcncd liitcfally, 

 •rliihrou.s. Ciiqu'l imicli tliiltciu'd dorsally. willi liliroiiii doi'siil and 



iiit(M'm('(liat"' fil»s; laterals cxcfssivcly 

 cofky thickened. iiiNoliite (tliat is. 

 extended towai'd (lie other ciirpel. 

 h'iiviny" la'lween the eoinniissiifal faces 

 a cavity, wiiich is divided lonoitiidi 

 ^ftfr^ns:^^ iially l>y a ihicU corky projection from 

 the inidiUe of each face); id! witii dis- 

 tinct <iT()Ui)Si of streiiLtlhenini:" ceils. 

 8tyl()i)odiiMii depi'essed. Oil liil)(>s 

 very small, ;> in .he intervals, ri to 4 

 on the commissiirid side. Seed ftiee 

 sliohtly coiica\'e. 



Dwiirf <il!d)roiis nearly iicaidescent jjlants. from tul)erous or fusi- 

 form roots (underuround ptirt of the stem sheathed with laroc scarioiis 

 bracts), with terntite leaves and linear seo-iuents. no involucre, involii- 

 eels of few linciir hnictlets, and white (lowers in sid)compound uudjels 

 with Ncry unecjual rtiys. 

 'lype species, O. Ilii,<(fif<>l!(i Watson. 



A oi-oup of two species, restricted to th(>. ITnited Stiites west of the 

 Uocky Mountiiins. 



Stems from ik'ep-seate<l round tnbor.s L <>. liiii'tirifnUii. 



Stems from loiiy: fnsiforin roots L'. <>. /iisil'iiriiiif. 



1. Orogenia linearifolia Watson, Bot. King Surv. 120. pi. 14, (igs. \-'3. 

 ISTI. Fi(i. i'2. 



Striu (or scape) slender, rising li to 12 cm. tiliove ground from ii 

 deej)-seated round tul)er; leaves 2 or ;>, once or twice ternate, upon 

 slender petioles; letifiets entire, 2.;") to 5 cm. long. '2 to (J mm. wide, 

 obtuse; umhels 2 to lO-rtiyed, with nearly sessile llowers; fruit H to ! 

 mm. long. liitenU ribs iind counnissurtd projection imu-h more strongly 

 de\eioped than in O, f\(,slf()rmi.s. 



rm 



Fie. 12.-- OroKonIn linearifolia: 



11, b, ■ X. 



