974 HY DROLEACEAE 
pedicelled: lobes 5, narrow. Corolla often blue, funnelform or salverform: lobes 5, broad, 
imbricated. Stamens 5, included or nearly so: filaments irregularly adnate to the corolla- 
tube. Ovary 1-celled or sometimes imperfectly 2-celled. Stylesdistinct. Ovules numer- 
ous on each placenta. Capsule subglobose to oblong, 2-valved. Seeds very small, rugose. 
The plants flower mainly in the spring. 
Leaves decurrent on the stem. 1 
Leaves not decurrent on the stem. 
Stem-leaves with sessile more or less manifestly clasping bases. 
Calyx-manifestly pedicelled : capsule about 14 as long as the calyx. 2. M. macranthum. 
Calyx sessile or nearly so: capsule more than 74 as long as the calyx. 
Calyx-lobes linear-spatulate : capsules oblong, shorter than thecalyx-lobes. 3. M. undulatum. 
Calyx-lobes narrowly linear: capsules cylindric, about as long as the calyx- 
lobes. . . M. stenocarpum. 
Stem-leaves nearly sessile, often narrowed to the base, lower ones often mani- 
festly petioled. 
Corolla narrowly funnelform, much longer than the calyx. A 
Capsule slightly shorter than the calyx-lobes: corolla about 9 mm. long. 5. M. hispidum. 
Capsule slightly over 14 as long as the calyx-lobes: corolla about 10 mm. 
. M. Jamaicense. 
long. 6. M. tenue. 
Corolla short-funnelform, barely surpassing the calyx, or only slightly longer. PE 
Annual plants : yf eh A as long as the calyx: seeds pitted in rows. 7. M. angustifolium. 
Perennial plants: capsule about 1⁄4 as long as the calyx : seeds smooth. 8. M. origanifolium. 
1. Marilaunidium Jamaicénse (L.) Kuntze. Annual, pubescent. Stems branched 
at the base ; branches spreading or prostrate, 1-4 dm. long: leaf-blades spatulate, often 
broadly so, 1-5 cm. long, each tapering into a petiole-like base decurrent on the stem as a 
wing: pedicel stout, 1-5 mm. long: calyx hirsute ; lobes narrowly linear or linear-spatu- 
late, 6-8 mm. long, acute, ciliate: corolla white or purple, about as long as the calyx-lobes : 
capsules narrowly oblong, 8-10 mm. long. [Nama Jamaicense L.] 
In moist soil, Florida and Texas. Also in the West Indies and Mexico. 
2. Marilaunidium macránthum (Choisy) Kuntze. Annual, hirsute. Stems branched 
at the base; branches spreading or prostrate, 0.5-3 dm. long: leaves numerous ; blades 
spatulate to oblong-spatulate, 1-4 cm. long, obtuse or acutish : pedicels 4-10 mm. long : 
calyx bristly ; lobes linear-spatulate, 8-10 mm. long, acute, ciliate : corolla about twice as 
long as the calyx: capsules oblong, about 3 as long as the calyx. [Nama undulatum var. 
macranthum Choisy. ] 
On plains and prairies, Texas and Mexico. 
3. Marilaunidium undulàtum (H.B.K.) Kuntze. Annual, hirsute. Stems be- 
coming diffusely branched, prostrate, 1-3 dm. long : leaves variable ; lower ones with spatu- 
late short-petioled blades; upper sessile, oblong, all varying from 1-3 cm. long, often 
crowded : pedicels solitary or several together, 1-2 mm. long: calyx bristly ; lobes linear- 
spatulate, 6-10 mm. long: corolla funnelform, slightly surpassing the calyx : capsules ob- 
long, shorter than the calyx, granular. [Nama undulatum H.B.K.] 
On plains and prairies, southern Texas and Mexico. 
4. Marilaunidium stenocárpum (A. Gray) Kuntze. Annual, hirsute. Stems more 
or less diffusely branched ; branches spreading or prostrate, 1-3 dm. long: leaf-blades 
spatulate to oblong, 1-2 cm. long, blunt, crisped: pedicels very short or none: en 
bristly ; lobes narrowly linear, 7-9 mm. long, keeled : corolla about 8 mm. long: capsules 
cylindric, shorter than the calyx. [Nama stenocarpum A. Gray. ] 
On plains and prairies, Texas and Mexico to Arizona. 
5. Marilaunidium hispidum (A. Gray) Kuntze. Annual, hispid or hirsute. Stems 
branched at the base ; branches spreading or prostrate, 0.5-2 dm. long: leaf-blades ped 
late or linear-spatulate, 1-4 cm. long, obtuse, the lower short-petioled ; upper sessile : ^ S 
cels 1-2 mm. long: calyx bristly ; lobes narrowly linear, 4-6 mm. long, often slig m 
broadened upward: corolla about 8 mm. long; tube surpassing the calyx: capsules nar 
rowly oblong, shorter than the calyx, wrinkled. [Nama hispidum A. Gray. ] 
On prairies, Texas to Arizona. ll 
6. Marilaunidium ténue Small.! Annual, hirsute. Stems erect, 1-1.5 m: wer 
simple below, dichotomous above, wiry: leaves opposite ; blades linear or slightly den j 
ened upward, 1.5-3 cm. long, sessile : pedicels slender, 1-3 mm. long: calyx bris yi 
lobes linear-filiform, 4-5 mm. long, erect, acute : corolla purplish, 5-6 mm. long, mo 
1 Marilaunidium stenophyllum (A. Gray) Kuntze, a shrubby plant with densely eee 
foliage, corolla longer than the calyx and capsule about 3 as long as the espe rÀ 
occur within our range. It was first found in Coahuila, Mexico, and later on me 
side of the Rio Grande. 
