ENGELMANN — NEW SPECIES OF GENTIANA. 217 



Gentiana (Chondrophylla) prostrata, var. Ameri- 

 cana: foliis erecto-patulis ovatis obtusis mucronulatis sou 

 muticis ; floribus parvis 4-fidis azureis, calycis corollreque 

 lobis acutis, pliois triangularis plerumque intcgris ; capsula 

 lineari-oblonga in stipitem brevera attenuata. 



On Monnt Flora and other alpine peaks of the Snowy 

 Range, Colorado, Parry, No. 30G ; Hall & Harbour, No. 475; 

 Russian Arctic America, Chamisso in Herb. Gray. — A very 

 small form, 1—2^ inches high, single or with a few ascending 

 or prostrate brandies from the base ; flowers always 4-partecl, 

 (in the European plant, which I have been unable to com- 

 pare, they are said to be 5-parted,) deep azure blue, h\— 6 1. 

 long, scarcely 1 1. in diameter ; capsule tapering at base, not 

 abruptly rounded; seeds finely stimulate, \ 1. long. 



PL 9, Fig. 10, 3 specimens of the smaller form, nat. size : 

 11, a flower ; 12, corolla, laid open ; 13, pistil ; 14, capsule, — 

 all 4 times magnified; 15, seeds, 10 times magnified. 



Gentiana (Chondrophylla.) humilis, Stev.inAct.Mosq. 

 3, p. 258, ex Gris. in DeC. Prod. 9, p. 106 ; G. Fremontii, 

 Torrey in From. 1st Exped., p. 94; along moist grassy banks 

 of Upper Clear Creek, Bear Creek, and other mountain 

 streams, with Polygonum viviparum, almost hidden among 

 grass and sedges ; Parry, No. 135 ; Hall & Harbour, No. 

 474 ; on the Wind River Mountains, Fremont ; fl. June and 

 July. — Many erect or ascending, rarely prostrate, one-flower- 

 ed, fragile, succulent stems, 1--5 inches high ; pale green leaves 

 with a broad white margin, cuspidate or mucronate, — lower 

 ones orbicular or ovate, rosulate, — cauline ones linear-oblong, 

 connate at base and sheathing; flowers on short or longer 

 peduncles, 4-4^ 1. long, with spreading rotate limb (Parry), 

 green with bilobed white and transparent folds ; ovary lance 

 oval on a short stipe, style short with recurved stigmas; cap- 

 side on a stipe of different length, usually raised above the 

 corolla, but sometimes enclosed in it, and then, at last, burst- 

 ing sideways through the integuments, as appears on the left 

 hand branch of our figure; valves of capsule at last widely 

 opening, as the figure shows, and giving the plant a very sin- 

 gular appearance ; seeds irregularly linear-oblong, nearly \ 1. 

 long, finely striulate, very similar to those of the last species. 



3 G. barbcllata, Eng. : perennis, in pedunculis subnullis uniflora, cros- 

 sopetala. 



b. Pterospermese. 



4. G. ciliata, Linn. : perennis, in pedunculis brevibus pluriflora, cros- 

 sopetala. 



5. G. siinplcx, Gray: annua, in pedunculo elongate- uniflora, leio- 

 petala. 



The seeds of the annual G. ventricosa, G. macrocalyx, and the perennial 

 G. macrantha, all with fringed corolla, are unknown. 



