(573 NTCTAGINB^. (FOUK-0-CLOCK FAMILY.) 



lobes oblong, obtusish, alike ; corolla-lobes ovate, mucronate, with a 

 buff-colored throat — Spring — Sands ; Wadi-Zuweirah and southward 

 to Sinai and Egypt. 



21. P. areiiaria, W. K. © .3 to .5, pubescent ; stem erect or 

 diffuse, stiff branched. Leaves linear to filiform, .03 to .06 long, .001 

 to .002 broad, entire, margin somewhat revolute, base often villulose. 

 Peduncles axillary, longer than leaves, more or less umbelled ; spikes 

 ovate, .01 long, dense; bracts papillose-hirtulous at back, the lowest 

 ovate, tapering into a Tierdaceous cusjy longer than floicers, the u^jper spathu- 

 late-07'Ucular, mem'branoiis-margi7ied ; anterior calyx-lobes obliquely 

 ovate, oMuse, posterior lanceolate, acutish, membranous; corolla-lobes 

 ovate-lanceolate, acute — Spring — Sands in valleys about the Dead 

 Sea, and southward to Egypt. 



Var. divaricata, Boiss, Branches forked. Leaves shorter and 

 broader — A maritime form. 



22. P. sqiiarrosa, Murr. © .2 to .3, papillose-hairy, branch- 

 ing from neck ; stems diffused or ascending, usually branching. Leaves 

 somewhat fleshy, linear to linear-oUong, .02 to .04 long, .003 to .005 

 broad, often recurved. Peduncles axillary, as long as leaves or shorter; 

 3-5 together; spikes pubescent, oblong to cylindrical, .01 to .02 long; 

 the lower j?:>«W' of h'acts forming an involucre to the spile, sometimes elon- 

 gated, oblong -lanceolate, recurved, somewhat narrov^ed above the dilated 

 base; the upper oblong, obtusish, as long as calyx or longer; anterior 

 calyx-lobes oblong-spathulate, somewhat oblique, posterior oblong, 

 keeled ; ccroUa-lobes ovate-oblong, acute — Spring — Sands along coast. 



Var. toracliystacliys, Boiss. Spikes globular or flattened- 

 hemispherical ; lower bracts shorter and thicker. 



DIVISION V. MONOCHLAMYDE/E, D. C. APETAL0U8 PLANTS. 



Floral envelopes usually in one row, resembling either a 

 calyx or a corolla. Some genera or species of these orders 

 have both calyx and corolla. 



Ordek LXXXI. NYCTAGIMEi®, Lindl. (Four-o-Clock Family.) 



Herhs or shruhs, (ours J with oj^j^osite leaves, stems 

 tumid at the joints^ a camfyanulatfi, tuhular, or fminei-form 

 calyx reseiriblincj a coroUa, its ])ersistent tuhe constricted 

 alove the 1-celledy 1-seeded ovary and nut-lihe fruit; the 

 stamens (in ours) 1-3, hyjyogynous ; the embryo (in ours) 

 condu])licate, enclosing the mealy cdlumen — Flowers (in ours) 

 hermaphrodite. Stamens inserted on a cup-like disk, usually 

 connate at base. Ovary free, short-stipitate ; style simple, 

 radicle inferior— Herbs with shrubby base. 



BCERHAAVIA, L. Bcerhaavia. 



Flowers destitute of involucre, hermaphrodite. Perigonium cam- i 

 panulate or funnel-shaped, the limb 5-lobed, marcescent, usually decid- i 

 uous with the upper part of tube. Anthers somewhat exserted, 2-celled. ■ 



