ENGELMANN — SEW SPECIES OF GEXTIANA. 215 



even some doubts about the specific difference of G. tenuis, 

 which is characterized by smaller flowers, short, obtuse or 

 retuse lobes of the corolla with sparing fringes, and (in my 

 specimens) very indistinct glands at the base: specimens of 

 G. acuta, with strictly erect branches, smaller, greenish Mow- 

 ers, and small seeds, seem to approach it almost too closely. 



PI. 9, Fig. G, represents two specimens of our plant ; 7, a 

 flower; 8, corolla laid open; 9, pistil. Fig. 7--9, 4 times mag- 

 nified. 



Gentiana (Amarella) heteeosepala, spec.nov.: annua, 

 humilis, erecta, simplex, pauciflora, glabra; foliis infimis obo- 

 vato-spatulatis, superioribus ovatis basi lata sessilibus obtusis 

 seu subacutis margine (sub lente) scabrellis; floribus singulis 

 breviter pedunculitis; calycis 5-fidi lobis 2 maximis ovatis 

 acutis corolam fere aequantibus, reliquis 3 brevioribus lineari- 

 subulatis ; corollae basi indistincte glanduliferse fauce ciliis 

 paucis barbatae laciniis lineari-oblongis obtusis tubum dimi- 

 dium aequantibus patulis; antheris ovato cordatis; pistillo 

 lineari. 



Northern slope of the Uintah Mountains, east of the Great 

 Salt Lake ; beginning to flower at the end of August ; II En~ 

 gelmaun, in Capt. Simpson's Exped., 1S59. — A very slender 

 plant, 2-4 inches high, usually with 4 pairs of leaves of a 

 delicate pale green color, the larger ones 6—10 1. long, 4-5 1. 

 wide; fl. 6 1. long, pale grayish-blue; cilise of throat few, in 

 two fascicles at the base of each lobe. Remarkable for the 

 great disparity of the calyx lobes ; in that respect near G. 

 campestris, but very different otherwise, and, like G. tenuis, 

 a connecting link between Grisebach's Amarellse and Arcto- 

 philae. 



PI. 8, Fig. 1. One of the largest specimens: 2, a single 

 flower; 3, calyx, spread out; 4, corolla, laid open; 5, pistil. 

 Fig. 2-5, 4 times magnified. 



Gextiana (Akctopiiila) Wislizetst, spec, nov.: annua, 

 erecta, ramosa, glabra ; foliis (sub lente) margine scabrellis, 

 imis spatulatis obtusis, superioribus e basi latiore sessili lan- 

 ceolatis 3—5 nerviis obtusiusculis, summis acutis ; cyma con- 

 tracts thyrsiformi; calycis membranacei truncati lateraiiter 

 fissi spathacei lobis herbaceis linearibus tubo suo multo bre- 

 vioribus corolla3 tubum dimidium fere attingentibus ; corollas 

 laciniis ovato-lanceolalis acutiusculis tubo angusto sensim 

 dilatato basi glandulifero bis brevioribus basi breviter bar- 

 batis vel nudiusculis ; ovario capsulaque lineari-lanceolata 

 subsessili. 



Mountains of Llanos in the State of Chihuahua, 7,000-8,000 

 feet high, in pine woods; fl. in October; Dr. A. Wislizenus, 

 1846. — Stems 10-12 inches high, strictly erect; leaves 1— 1| 

 inches long, 3-4 1. wide at base; calyx 2 1. long, slit to the 

 base; pale bluish corolla, 5 1. long, with 5 strongly marked 



