BORKAGINACE^. (bOEAGE FAMILY.) 359 



3. TOURNEFORTIA, L. 



Calyx 5-parted. Corolla salverfonn or wheel-shaped, 5-lobed. Stameus 5, 

 included. Style short, terminal; stigma couical. Drupe composed of two 

 ^seeded nutlets, which are either united or separable, or by abortion 1 -2- 

 seeded. — Erect or twining shrubs, with entire leaves, and white or yellowish 

 flowers, in 1-sided bractless often cymose spikes. 



* Fruit orate, sejiarable into two 2-seeded mitlets: corolla lobes ovale, plicate. 



1 . T. gnaphalodes, R. Br. Wiiite-silky throughout ; stem tliick, erect ; 

 leaves very numerous and imbricated, linear, obtuse, fleshy, tapering to the 

 base ; peduncles axillary ; spikes 2 - 4-parted, dense, recurved ; caly.x. lobes 

 obloLg, obtuse ; corolla fleshy ; anthers ovate ; drupe deeply excavated at the 

 base. — Seashore, South Florida. — Siirub 2° -4° high. Leaves 3' long. 

 Corolla small, white. 



* * Fruit globose, more or less lobecl, composed of I -4 nutlets, each \ -seeded : 

 corolla lobes narrow, acute. 



2. T. volubilis, L. Stem twining, and, like tlie lower surface of the 

 leaves and .-spikes, tomentose ; leaves ovate or oblong-ovate, petioied, rougliisli 

 above, paler beneath ; spikes lateral and terminal, very slender, cymose, short- 

 peduucled, spreading ; tube of the corolla contracted in the middle, tlie lobes 

 liuear-subulate; anthers coiiniveut; drupe sn)all, 1 -3-seeded. — South Florida. 

 — Leaves V -\h' long. Corolla 2" lung. 



4. HELIOTROPIUM, Touru. 



Calyx 5-parte(l, persistent. Corolla s-alver-furm, folded between the 5 lobes. 

 Filaments and .style very short. Stigma somewhat conica'. Fruit separable 

 into four 1 -seeded, or into two 2-seeiled nutlets. — Herbs or shrubby plants. 

 Leaves rarely opposite. Spikes 1-sided. Flowers white or blue. 

 * Throat of the corolla ope.n. Nullrts 4, each 1-seeded. 



1. H. polyphyllum, Lehm. Rough, wiUi short appres.sed white hairs; 

 stems (1° long) spreading from a woo<ly root, very leafy; leaves nearly 

 sessile, lanceolate ; spikes leafy ; nutlets 4, hairy ; corolla wliite, or, in var. 

 Leavenworthii, Gray, l)right yellow. — South Florida, tlie variety near Miami 

 ( Garber). 



2. H. tenellum, Torr. Annual, rough-hairy; stem erect (6'- 12' high), 

 slender, branching; leaves linear; rneemes leafy or naked, remotely few- 

 flowered, calyx If >hes linear, une<jual ; corolla white. — xMabama, West Ten- 

 nessee, and westward. 



3. H. Curassavicum, L. Annual, smooth, fleshy; stems at length 

 prostrate and diffuse ; leaves alternate or ojiposite, lanceolate or linear, ob- 

 tuse, narrowed at the base; spikes peduncled, simple or 2-parted, coiled in the 

 bud ; flowers small, sessile, white, bractless ; nutlets smooth. — Saline marshes, 

 Florida to North Carolina. June -August. — Stem 6'- 18' long. Leaves 

 l'-2' long. — Plant dries black. 



4. H. phyllostachyum, Torr. Annual ; stem erect, branched, rough 

 with rigid white appressed hairs ; leaves oblong or lanceolate, obtuse, hispid. 



