CATALOGUE. 195 
sionally two flowering branches are found on the same plant, or three 
pairs of leaves in place of two, or, very rarely, the upper involucral leaves 
bear one or even two axillary flowers. 
GenTianA Wisuizenu, Engelm. 1. ¢. pl. 7; Gray, Syn. 119.—Annual, 
erect, a foot or less high, with the habit and the many-flowered thyrsoid- 
paniculate inflorescence of the next; leaves from lanceolate to ovate, 1’ or 
less long, with an obtuse or subcordate base; calyx of barely half the 
length of the tube of the corolla, with very small teeth, its membranaceous 
tube cleft, and often, in age, dejected; corolla pale purplish, 4-5” long, acute 
lobes fringed above the base; capsule linear; seeds subglobose. 
White Mountains of Arizona, Rothrock (799), in 1874. This is the 
only known locality within our flora of this rare plant, which was discovered 
by Dr. Wislizenus over thirty years ago in the mouniains west of Chi- 
huahua. 
GenTIaANA AMARELLA, L., var. acura, Hook. f. Gray, Syn. 118. (G, 
acuta, Michx.).—Annual, 2-20’ high; stems wing-angled, usually much 
branched; lowest leaves obovate, petiolate, upper ones lanceolate sessile; 
inflorescence paniculate or strictly thyrsoid, with shorter erect or in some 
forms with elongated patulous peduncles; calyx deeply 5-cleft; herbaceous 
lobes lance-lingar, somewhat unequal, often as long as the tube of the 
bluish-purple corolla, the lobes of which are oblong, obtusish, beset at base 
with copious (or in the diminutive alpine form, few) sete; sessile capsule 
linear; seeds subglobose. 
Grassy places in the mountains of Colorado and northeastward. The - 
true European G. Amarella has usually 4-parted flowers 
Havenia Rornrocku, Gray, Proc. Amer. Acad. 11, 84; Syn. 127.— 
Annual, a span or two high, loosely flowered ; lower leaves small, spatulate, 
those of the stem distant, lance-linear, the uppermost closely approaching 
subverticillate ; flowers cymose-subumbellate, on slender peduncles, ofcen 
in sevens, nearly 6” long, bright yellow, ovate, acute lobes a little longer 
than the campanulate tube, the five spurs curved, horizontal or ascending, 
half as long as the corolla; stamens from the throat of the tube; anthers 
versatile ; seeds subglobose-ovate 
On Mount Graham, at 9,000 feet altitude; in flower in a? 
