I 



Convolvulus. CONVOLVULACE^E. 533 



1. CONVOLVULUS, Linn. BINDWEED. 



Corolla campanulate or short and open-funnelform, with more or less 5-angulate 

 or obscurely 5-lobed border, deeply plaited down the sinuses in the bud ; the plaits 

 convolute, commonly straight, sometimes contorted (either in the same direction as 

 the plaits overlap or in the opposite). Stamens included. Style filiform : stigmas 

 2, subulate, or in ours flat, and from narrowly linear to oval. Capsule globose, 

 2-celled (sometimes imperfectly so) : cells 2-ovuled and commonly 2-seeded : dehis- 

 cence when perfect septifragal, i. e. the valves separating from the partition. Em- 

 bryo with broad and foliaceous cotyledons, folded and crumpled in the seed. 

 Stems twining, trailing, or in some erect and bushy. Peduncles solitary in the 

 axils, in ours one-flowered, or occasionally 2-flowered. Ours are all perennial herbs. 



A rather large genus in the Old World, sparingly represented in the New. 



lPOM(EA (PHARBITIS) PURPUREA, and I. NIL, the common species of annual Morning-Glory 

 of cultivation and occasional naturalization in the Atlantic States, natives of Mexico, &c. , might 

 be expected to occur, either indigenous or adventive, in the southern part of the State ; but we 

 have not met with them. 



CALYSTEGIA, R. Brown, in view of the Californian species, is not even a well-marked section. 

 All the following species would belong to it except the last, and the next to the last, which is 

 ambiguous. 



* A pair of thin membranaceo-foliaceous bracts close to the calyx, and enveloping it 



or partly so. (Calystegia, E. Brown.) 

 -{- Herbage rather fleshy : stigmas ovate or oval. 



1. C. Soldanella, Linn. Maritime, low, glabrous : stems a foot or less in 

 length, trailing, rarely attempting to climb : leaves kidney-shaped, entire or ob- 

 scurely angulate-lobed, an inch or two broad, long-petioled : bracts ovate-cordate, 

 not longer than the sepals : corolla pink or purplish, an inch or more in length : 

 capsule becoming one-celled. Calystegia Soldanella & C. reniformis, E,. Brown. 



Sandy sea-shore, San Diego and northward to Puget Sound. Widely distributed over the 

 Pacific and European coasts. 



-*- *- Not jlesliy : stigmas linear, or at most oblong-linear. 



2. C. occidentalis, Gray. Glabrous or minutely pubescent : stems twining, 

 several feet high : leaves from broadly ovate-triangular with a deep and narrow 

 basal sinus to narrowly lanceolate-hastate ; the posterior lobes often 1 - 2-toothed : 

 peduncle elongated, not rarely 2-flowered within the bracts ; these ovate or rarely 

 oblong, commonly surpassing and enclosing the calyx : corolla white or pinkish, 

 1 to 1 1 inches long, and the expanded limb as wide. Proc. Am. Acad. xi. 89. 



Dry hills, through the western part of the State, from near San Francisco (Dr. Gibbons, with 

 SBhtller ovate-lanceolate and not enveloping bracts, and a second flower from the axil of one of 

 them) to San Diego (Cooper, Cleveland) : var. angustissimus, an extreme form, with 2-flowered 

 peduncles and very narrow linear-lanceolate sagittate leaves, Santa Barbara, Nuttall. The oppo- 

 site extreme, resembling a large and broad-leaved C. sepium, and with peduncle occasionally 

 3-flowered, is from Guadalupe Island, off 7 Lower California, Dr. Palmer. The stigmas are linear : 

 the style in age inclines to split in two. 



C. SEPIUM, Linn., which occurs northeast of California, and extends round the world, is distin- 

 guished by its ovate or oblong stigmas, and only one-flowered peduncles have been observed. 



3. C. Californicus, Choisy. Minutely and rather densely pubescent, or some- 

 what glabrate, a span or less high and subcaulescent, or producing trailing stems a 

 span to a foot long : leaves mostly obtuse, from ovate or obovate and obscurely has- 

 tate to triangular-hastate and the later ones acute, and the basal lobes sometimes 

 1 2-toothed, long-petioled : peduncles shorter than the petiole : bracts oblong or 

 oval, not unlike the outer sepals and equalling them, or rather shorter : corolla 



