694 PATAGONIAN EXPEDITIONS: BOTANY. 



2. RHAPHITHAMNUS PARVIFOLIUS Miers. 



Lower (4 m.) than last, with smaller leaves and shorter branches. 

 Leaves mostly ternate, ovate-oblong, gradually acute from their middle, 

 much dotted, not revolute. Spines few, exceeding the leaves. Axillary 

 racemes, about 3-flowered. Flowers pale blue. Drupe smaller than a 

 pea. 



(Chili & Is.) ; Valdivia, by Rio Negro. 



Family 98. LABIATE. Mint Family. 



Herbs or shrubs (or rarely tropical trees), with quadrangular stems and 

 opposite leaves, mostly aromatic. Flowers axillary in the upper leaves ; 

 usually in cymes or verticillasters, often forming a terminal spike or 

 thyrse. Perianth zygomorphous, sympetalous, bilabiate. Stamens 4, 

 didynamous, or only 2 ; epipetalous. Ovary superior, deeply 4-lobed ; 

 the style arising from its central depression, simple, apically bifid. Fruit 

 enclosed in the persistent calyx, separating into 4 small, i -seeded achenes. 

 Seeds with scanty or no endosperm. 



Species 3,000, widely distributed in temperate and warm climates. 



KEY TO THE GENERA. 



(The Patagonian genera have the style completely gynobasic ; dry nutlets with thin pericarp, 

 basilar, or rarely basi-dorsal, attachment, and usually small stigma.) 



A. Seed more or less transversal. Embyro with curved radicle lying on one of the cotyledons. 

 Mature calyx not urceolate, bipartite and a deciduous protuberance on its dorsal surface. 

 Its anterior segment persists. I. Scutcllaria, p. 695. 



A2. Seed erect. Embryo with straight, short, superior radicle. Disk -lobes when present alter- 

 nating with fruit-lobes. Nutlets with small, basilar attachment. 

 b. Filaments ascending, or diverging and straight. 



c. Corolla-tube usually included by the calyx ; stamens and style included ; nutlets ovoid, 

 rounded above. Dorsal lip of corolla specialized. Calyx 5-io-toothed. Anthers 

 diverging ; the pollen sacs ultimately fusing by their apex. Cymes axillary. 



2. Marrubium, p. 695. 



c2. Corolla-tube usually not included ; and stamens not included in the corolla-tube. 



Calyx 5 -toothed, or 2 -lipped with the lower lip at least toothed. Anther-lobes 



parallel or diverging, long or ovoid, but not fusing apically, and not spreading wide 



after shedding their pollen. 



d. Corolla strongly 2-lipped ; the upper lip concave, partly sickle or helmet-shaped 



Anthers ovoid. Stamens 4, the dorsal pair shorter. 



c. Calyx short-tubular, obscurely ribbed, 2-lipped, the lips short, entire. Corolla 

 exsert, with broad tube ; its upper lip broad-ovate, retuse ; its under lip 3- 

 lobed, the mid lobe twice as large as the side lobes, hairy inside. Stamens 



