264 CONVOLVULACE.aE. 



corolla f unnelform, J^ in. long, whitish : the throat with puberulent lines : 

 nutlets brownish, dull, coarsely wrinkled and pitted. — Occasional at 

 San Francisco; native of Europe. 



8. HELIOTROPIUM, Theophr. Genus differing from all others of 

 this order, in our flora, by a corolla with plaited lobes, anthers connivent, 

 and nutlets that are not seed-like in appearance, but resemble 4 sep 

 arated closed cells of a capsular fruit. 



1. H. Curassavicnm, L. A very fleshy glabrous and glaucous 

 depressed perennial: leaves obovate to much narrower, almost linear: 

 spikes mostly in pairs, dense-flowered: corolla white, with yellow eye. — 

 Common in low subsaline soils, chiefly in the interior. 



Order lxxiii. CONVOLVULACE/E. 



Herbs or shrubs, with milky juice, the stems usually twining or 

 trailing. Leaves alternate, petiolate, exstipulate. Peduncles axillary, 

 1-flowered, or cymosely several-flowered. Flowers regular, perfect, 5- 

 merous. Sepals mostly distinct, persistent. Corolla mostly plaited and 

 the plaits convolute. Stamens as many as the corolla-lobes and alternate 

 with them. Ovary entire or lobed; usually maturing as a capsule with 

 few and large seeds. 



Stems twining or trailing; corolla plaited. t Convolvulus 1 



" creeping; corolla not plaited Dichondra 2 



" erect or diffuse; corolla not plaited Cressa 3 



1. CONVOLVULUS, Pliny (Bindweed. Morning Glory). Corolla 

 funnelform, plaited and the plaits dextrorsely convolute. Stamens not 

 exserted. Style 1, cleft at apex; stigmas 2, linear to oblong or ovate. 

 Capsule globose, thin-walled, 2-celled or imperfectly 4-celled, mostly 

 2 — 4-valved, with few and large seeds. 



* Species naturalized from Europe. 



1. C. pbntapetaioides, L. Annual, slender, branching from the 

 base, 6 — 15 in. high, pubescent: leaves spatulate-oblanceolate: peduncles 

 1-flowered, bibracteate toward the summit: corolla small, purplish, deeply 

 S-lobed the lobes ovate. — Common in fields along the eastern base of the 

 Mt. Diablo Eange. March, April. 



2. C. arvensis, Li. Perennial, prostrate, the stems 1—3 ft. long: 

 leaves oblong-sagiltale or hastate, 1 — 2 in. long, the basal lobes short: 

 pedicels 1 — 3-flowered, with a pair of subulate bracts near the base: 

 corolla while, with a tinge of purple on the outside, neither lobed nor 

 angled.— Very prevalent as a weed in fields and by waysides. May — Nov. 



* * Native species; calyx embraced by a pair offoliaceous brads. 



3. C. Soldanella, L. Low, glabrous, slightly succulent; stems 10 — 15 

 in. long, prostrate: leaves reniform, deep green and shining, 1 — 2 in. long, 



