692 PATAGONIAN EXPEDITIONS I BOTANY. 



4. LIPPIA NODIFLORA (L.) Michx. 



Creeping, short, appressed, dense hairs. Leaves thickish, spatulate to 

 obovate, serrate toward their apex, entire and cuneate toward their base. 

 Pedtmcles slender, many times exceeding the leaves, arising from the 

 nodes. Heads ovoid. Calyx flat, 2-cleft. Corolla purple to white. 



(In warm parts of United States and W. Indies ; and in all tropical 

 sandy sea-coasts.) N. Patagon., by Roca Exped. 



5. L. SERIPHIOIDES A. Gray. 



Intricately branching, scabrid shrub. Leaves minute (2-5 mm. long), 

 fasciculate, linear-spatulate or cuneate, usually 3-lobed, revolute. Heads 

 globose, at length elongating, solitary or racemed from short axillary 

 peduncles. Bracts ovate, shorter than the bifid calyx. Anthers often 

 with glandular appendages. 



N. Patagon., by Rio Negro ; S. Patagon., at Puerto Madryn. (Dusen). 



The characteristic species of Patagonia, not extending far beyond its 

 boundaries; "Tomillo del campos" (Span.), "Loom" (Araucan.). Used 

 as Thyme for flavoring, and its infusion as medicine. 



(L. citriodora (Lam.) Kunth., also known as Aloysia, and as Verbena 

 triphylla, a stiff, branching shrub, with whorls of 3-4 leaves, and panicled 

 spikes of flowers, is a garden favorite on account of its fragrance. Being 

 a native of Chili, it may occur in North Patagonia.) 



4. MONOPYRENA Speg. 



Calyx tubular, 5-costate, 5-dentate, in fruit changing or scarcely accres- 

 cent ; corolla-tube straight, little enlarged upwards, limb patent, obscurely 

 2-labiate ; lobes 5, obtuse or retuse, the posterior external, the anterior 

 internal. Stamens 4, didynamous, inserted above the middle of the 

 retrorsely hispid tube ; anthers ovate, the upper pair produced to a cla- 

 vate appendage ; the lower pair not appendaged ; the cells subparallel. 

 Ovary superior, entire, even in anthesis perfectly 4-celled ; cells i-ovulate. 

 Style short, subtruncate, emarginate ; ovules fixed laterally near the base. 

 Fruit enclosed in the calyx, dry, quite glabrous, not separating (2 of its 

 pyrenes usually abortive), with an interrupted lacunula. Seeds linear, 

 erect, with thin testa. 



Distinguished from Lippia by the cells of the pyrene being 2 ; from 

 Verbena by the pyrenes not separating. 



