Conolohus. ASCLEPIADACE^. 103 



§ 1. DiCTYOLOBUS, Gray, I.e. Corolla reticulated and sometimes rugulose 

 with a fine network of colored veins ; the lobes commonly broad or roundish : 

 crown single. (The species mainly tropical and rather large-flowered.) 



G. reticulatus, Engclm. Higli-clinibin<i:, hirsute (especially tlie stems) with spreading 

 and reildish bristly liairs, minutely somewhat glandular : leaves (U to 4 inches long) deeply 

 cordate with incurved auricles, acute or acuminate : peduncles equalling or exceeding the 

 slender petiole and sometimes longer than the leaf, 5-9-flowered, thrice the length of the 

 flower : corolla lurid green, with purplish venation, half inch in diameter, glabrous within, 

 somewhat hairy without ; the lobes broadly ovate or obovatc : crown a narrow entire ring 

 around the ba%e of the distinct colunm : stigma circular : follicles fusiform and long-acu- 

 minate, 3 to 5 inches long, strongly niuricate. — Gray, 1. c. G. (jranulatiis, Torr. Bot. Mex. 

 Bound. 1G5, not Scheele. — Thickets and rocky banks, Texas to E. Arizona. (Monterey, 

 Mex.) 



§ 2. EuooNOLOBUS, Gray, I.e. Corolla not venulose-reticulated (at least not 

 conspicuously) ; the lobes from ovate-acuminate to linear : crown simple, un- 

 appendaged within, inserted at the junction of corolla and column or higher on 

 the latter : angles of the stigma little or not at all salient : stems herbaceous, 

 usually freely twining. (Pubescence variable, especially the hirsute and spread- 

 ing or reflexed hairs, which often occur on the stems, petioles, and sometimes on 

 the leaves.) 



* Peduncles umbellately or sometimos more cymosely few-many-flowered: corolla rotate, 5- 



parted ; the lobes steilately spreading or recurving, 

 -1— Tliickish in texture, dull or dusky yellowish-green, sometimes turning lurid-purplish within, at 

 least toward the base ; the bud conicid-acuminate, at least the outside (as well as calyx, pedicels, 

 and short peduncle) glabrous: crown a low and uudulately 10-lobed fleshy disk at base of short 

 column uiulerthe stigma: anthers narrowly bordered at sunuuitwith a scarious membrane which 

 overlies the edge oi" the stigma: follicles uiuirmcd, glabrous, :j-5-costate or angled, fleshy and 

 when mature and dry of spongy texture. 

 G. SUberosUS, R. Br. Leaves cordate with an open and shallow or sometimes deeper 

 and narrow sinus, acuminate, minutely pubescent, glabrate, or sometimes hairy (3 to 5 

 inches long) : umbels o-!l-tlowerod, much shorter than the petiole : corolla bi'oadly conical 

 and with abrupt acumination, twisted in the bud ; its lobes ovate or becoming triangular- 

 lanceolate, acute, of thickish and firm texture, dusky, minutely whitish-pubescent inside, 

 but sometimes glabrate, hardly double the length of the calyx-lobes. — Mem. Wern. Soc. 

 (name only) & Ilort. Kew. ed. 2, ii. 82 (1811) ; Gray, Proc. 1. c, not Decaisne. C'i/»anchum 

 suhcrosum, L. Spec, as to Dill. Elth. i. 308, t. 220, f. 290. Vinretoxicumr/onocarpos, Walt. Car. 

 104, at least in part. Gunolohus macrophi/llus, Chapm. El. i. 308, not Miclix. — Virginia to 

 Florida, along and near the coast. 

 G, leevis, Michx. Usually less pubescent or hairy : leaves (in the typical form) oblong- 

 cordate with a deep and narrow but open sintis, conspicuously acuminate (3 to inches 

 long) : umbels r)-10-flowered, barely equalling the petiole : corolla ratlier elongated-conical 

 in the bud, not twisted ; its lobes (3 to 5 lines long) narrowly or linear-lanceolate, obtuse, 

 glabrous inside, 3 or 4 times the length of the calyx. — El. ii. 110; Gray, Man. ed. 5, 399. 

 — Mississii)pi to Arkansas and E. Texas. Passes freely into 



Var. macrophyllus. Leaves broadly cordate, and with tlie rounded basal lobes 

 approximate or even overlapping, abruptly acuminate, the larger often 9 or 10 inches long 

 and 7 or 8 broad, the under side commonly soft with a tine and short or sometimes granular- 

 glandular pubescence : calyx-lobes often ciliolate toward the apex. — G. macrophjllus, 

 Michx. 1. c. G. viridiJJorns, Nutt. Gen. i. 103 ; therefore G. NuMaUi!, Decaisne in DC. Prodr. 

 viii. 598. G. tilia'foHus, Decaisne, 1. c. 590. G. r/rdnHlatus, Scheele in Linn. xxi. 759. Vince- 

 toxicum gonorxirpoa, Walt. Car. 104, in part. — Virginia and Carolina to Texas, Kentucky and 

 Missouri. 



^_ ^_ Corolla thinner in texture, mostlv purple or whitish ; the lobes obtuse: crown cupulate, as 

 high as the anthers: membrane of the" latter inconspicuous or obsolete, or not inflected oyer the 

 cdc;c of the stigma: peduncle with the umbel or cymose cluster equalling or surpassmg the 

 petiole: follicles ovate-lanceolate, terete, muricate : stems in all varialdy hirsute: calyx and out^ 

 side of the corolla more or less pubescent or puberulent. 



