158 
IIT. Ovules solitary: leaves in whorls, without stipules. 
10. Galium. Corolla rotate, 4- (rarely 3-) parted: calyx-teeth obsolete: fruit 
twin, separating into 2 indehiscent 1-seeded carpels. 
1. BOUVARDIA Salisb. 
Low shrubs or perennial herbs, with mostly whorled leaves, sabulate 
interposed stipules, handsome tubular flowers in terminal cymes, calyx 
with a turbinate or campanulate tube and 4 subulate persistent lobes, 
tubular or salverform corolla with 4 or 5 short lobes, 4 or 5 stamens 
inserted on or near the throat of the corolla, filiform style, 2 stigmas, 
2-celled ovary, and a didymous-globose coriaceous pod, with peltate seeds 
imbricated on the globular placente. 
1. B. triphylla Salisb. Suffruticose or more shrubby, scabro-puberulent, 6 to 
15 dm. high: leaves in 3s or 48 (or in pairs on branchlets), from oblong-ovate to 
broadly lanceolate, usually hispidulous-scabrous, 3 or 4-veined each side of the mid- 
rib: corolla scarlet, about 2.5 cm, long, pubescent outside.—A species of southern 
Arizona, represented in Texas by var, ANGUSTIFOLIA Gray, which is cinereous-puber- 
ulent or hirtellous, with smaller leaves (16 to 36 mm. long), which are subsessile, 
less veiny, from oblong-lanceolate to almost linear. (B. hirtella Gray, Pl. Wright.)— 
In the mountains west of the Pecos. 
2. HOUSTONIA L. 
Low herbs (a few suffruticulose), with short entire stipules connect- 
ing the petioles or narrowed bases of the leaves, cymose or solitary and 
peduneled dimorphous flowers, 4-lobed persistent calyx, salverform or 
funnelform 4-lobed corolla, 4 stamens, single style and 2 stigmas, 2- 
celled ovary, and a top-shaped, globular, or didymous thin pod with 
rather few peltate and saucer-shaped or thimble-shaped pitted seeds. 
$1. Low herbs, with leaves not rigid. 
* Small and delicate: corolla salverform: anthers or stigmas included or only partially 
emerging: peduncles single, elongated and erect in fruit: seeds globular, with a very 
deep round cavity o¢cupying the inner face. 
1. H. patens Ell. From 2.5 to at length 15 em. or so high, with ascending 
branches and erect peduncles: leaves spatulate to ovate: corolla small, violet-blue 
or purplish, the tube more or less longer than the lobes and twice the length of the 
calyx-lobes.—Dry or sandy soil, in the low grounds of eastern Texas, and probably 
within our limit at the south. Var. pusiLLa Gray is 2.5 em. or so high, more diffuse 
in age, with leaves narrowly spatulate, the upper ones nearly linear.—Texas (Drum- 
mond), possibly east of our range. 
2. H.minima Beck. More diffuse, commonly scabrous: stems at length much 
branched and spreading (2.5 to 10 em. high): lowest leaves ovate or spatulate, the 
upper oblong or nearly linear: earlier peduncles elongated and spreading in fruit, 
the later ones short: tube of the purplish corolla not longer than its lobes or the 
ample calyx lobes (3 mm. long).—Dry hills, throughout eastern Texas, and as far 
west as Gillespie County. 
* * Slender leafy-stemmed annual, with lateral horizontal peduncles and very small 
lowers: corolla short-salverform: seeds crateriform, with a medial ridge. 
3. H. subviscosa Gray. Minutely viscidulous-pubescent, with rather simple 
spreading branches: leaves narrowly linear, 12 mm. long: peduncle in first fork and 
