ENGELMANN NOTES ON THE GENUS YUCCA. 39 



concavis saspius plicatis opacis fere glaucescentibus dorso asperu- 

 lis pungentibus ; panicula angustiore nunc pubescente pedun- 

 culata folia excedente, bracteis e basi lata lanceolatis, summis 

 marcescentibus ; staminibus ovarium prismaticum apice attenua- 

 tum stigmatibus gracilioribus coronatum subaequantibus, effoetis 

 uncinatis. 



Forma genuina : foliis latioribus rigidis rectis ; panicula 

 angusta pubescente seu glabrata. 



Var. ft. plicata : foliis latioribus tenuioribus valde plicatis ex- 

 terioribus patulis ; filamentis parce papillosis ovario asquilongis 

 demum circinato-uncinatis ; stigmatibus distinctis subdivergenti- 

 bus basi in stylum brevem contractis. 



Var. y. recurvifolia : foliis debilioribus patulis recurvis, juni- 

 oribus glaucis ; panicula subpuberula ; filamentis parce papillo- 

 sis pistillum aequantibus. — T. recurvifolia, Salisb. 



Var. 0. planifolia: caule brevissimo ; panicula ovata subsessili 

 folia angustiora plana vix excedente staminibus pistillum aequan- 

 tibus demum uncinatis ; stigmate brevi crasso sessili. 



North Carolina to Florida on sandy sea-beaches. — All the 

 specimens I have seen came from South Carolina, and belong to 

 the principal form. Their stem is from a few inches to 4 or 6 

 feet high and 4-6 inches in diameter, simple or with a few branches 

 and even the oldest ones entirely covered with a shaggy coat of 

 old withered pendant leaves. -Leaves 2-22 feet long and I2-2? 

 inches wide, stiff, sharply pungent, very frequently longitudinally 

 folded, the narrower ones sometimes even. The edge of the 

 young leaf is pale and usually delicately serrulate toward the 

 base ; later it turns brown and brittle, the asperities disappear, 

 and it is apt to crumble off or occasionally to detach itself in a 

 few fibres. The surface of the leaf is of a dull, often pale or 

 glaucous, green, and on the under side, especially towards the tip, 

 rough with small asperities. The panicles — 2-4 feet long, 1-12 

 feet in diameter, contracted upward and downward, where the 

 flowers often spring directly from the main axis — are raised above 

 the leaves on a stalk of their own length or shorter, beset with 

 herbaceous bracts, lanceolate from a broad base ; ultimate bracts 

 of same shape, small and membranaceous ; panicle, or at least 

 the pedicels, often pubescent, or nearly or quite glabrous. Flowers, 

 as in the genus, wide open in the evening, 35-4 inches wide, 

 whitish, tinged externally with green or brownish or reddish 



