Macrosiphonia. APOCYNACE^. 83 



cymes loose, spreading, naked and mostly surpassing the leaves : corolla flesh-color, open- 

 campanulate (3 or 4 lines long) with revolute lobes ; the tube exceeding the ovate acute 

 calyx-lobes. Spec. i. 213 ; Lam. 111. t. 176 ; Bot. Mag. t. 280 ; Bigel. Med. t. 36. Borders 

 of thickets, Canada to Georgia, New Mexico, California, and Brit. Columbia. Var. incanum, 

 A. DC., is the downy-leaved form, not uncommon northward. 



Var. pumilum, a very low and peculiar round-leaved form, common from California 

 to Brit. Columbia. 



A. cannabilium, L. Erect or ascending, glabrous or sometimes soft-pubescent : branches 

 ascending, leafy to the top : leaves from oval to oblong and even lanceolate, from short- 

 petioled to sessile, with a rounded or obscurely cordate base : cymes erect, densely flowered : 

 corolla greenish-white or slightly flesh-color, smaller than in the preceding, with almost 

 erect lobes, and tube not longer than the lanceolate calyx-lobes. Spec. 1. c. ; Hook. Fl. 

 t. 139; Gray, Man. ed. 5, 394. A.hypericifdivm, Ait. Kew. ed. 1, i. 304; Hook. 1. c. t, 140; 

 form with mostly sessile and sometimes subcordate leaves. A. Sibiricum, Jacq. Vind. iii. 

 t. 66. A. pubescens, It. Br. in Wern. Soc. i. 67 ; the downy form. Moist grounds and banks 

 of streams, same range as the preceding, and more southern ; occurring in a much greater 

 number of forms, hardly to be distinguished as named varieties. 



6. CYCLADENIA, Benth. (Kt>y.^og, a ring, and ddi t v, gland, from the 

 circular glandular disk around the pistil.) Low perennial herbs (Californian) ; 

 with a creeping rhizoma sending up a simple stem, hardly a span high, and bear- 

 ing 2 or 3 pairs of opposite petiolate leaves, of a thickish texture, and one or two 

 slender terminal or apparently axillary peduncles, with a few rose-purple flowers 

 on slender pedicels, developed in spring. PI. Hartw. 322. 



C. humilis, Bentll. Glabrous and green, or pruinose when young : leaves ovate or 

 obovate, thickish, 1 to 3 inches long : calyx-lobes from lanceolate to nearly linear : corolla 

 three-fourths inch long. Yuba to Shasta Co., California, in the mountains, flartwey, 

 Brewer, &c. 



C. tomentosa, Gray. Densely tomentose-pubescent throughout : leaves ovate and 

 oblong, 2 or 3 inches in length: calyx hirsute. Bot. Calif, i. 474. Plumas Co., Cali- 

 fornia, with the preceding, Lemmon. 



7. MACROSIPH6NIA, Muell. (Arg.) (MaxQo*, long, and aiyow, tube, 

 in reference to the corolla.) Erect suffrutescent or more woody plants (of Mexico, 

 Texas, and Brazil) ; with rather simple stems or branches, numerous opposite or 

 sometimes verticillate leaves, and proportionally large showy flowers, either ter- 

 minal or becoming lateral, on short peduncles or pedicels ; the corolla commonly 

 soft-puberulent or tomentose outside. Follicles erect. Mart. Fl. Bras. vi. 137, 

 t. 42, 43 ; Benth. & Hook. Gen. ii. 727. Flowers in ours white or externally 

 tinged with rose-color, vespertine, fragrant, in spring or summer ; the leaves 

 very short-petioled. 



M. Berlandieri. A foot or two high, shrubby, white-tomentose : leaves from oval or 

 cordate-ovate to orbicular (an inch and more long), becoming greenish and merely pubes- 

 cent above, the diverging veins at length conspicuous : corolla merely puberulent outside, 

 its slender tube (with the cylindraceous-dilated throat) 3 to 5 inches long, many times 

 exceeding the calyx and the round-obovate (nearly inch long) lobes. Echites macrosiphon, 

 Torr. Bot. Mex. Bound. 158, t. 43. Rocky soil, W. Texas and adjacent parts of Mexico, 

 Berlandier, Wright, Lindhcimer. 



M. Wrightii. Slender, branching, a foot high, soft-puberulent : leaves narrowly lan- 

 ceolate, acute, white-tomentulose beneath, glabrous or nearly so above : tube of the corolla 

 and its cylindraceous throat each half inch or more in length, tomentulose, the lobes 

 half inch long. W. Texas, in mountains beyond the Limpio, Wriijht. 



M. brach^siphon. A span to a foot high, branching, minutely puberulent, green or 

 barely cinereous : leaves oblong or ovate, acute or mucronate-pointed, or some rounded at 



