VERBENA FAMILY 



383 



ments at middle of throat, the anthers of these latter with a glandular appendage; 

 nutlets subeylindric, the commissure reduced and narrow, not extending to apex, 

 ornamented with a white band of retrorse hispidulose hairs. 



Sandy slopes in the hills or rich flats in eailons, 2000 to 4000 feet : eastern Mohave 

 Desert. East to southern Nevada and Arizona. May. 



Tax. note. — The leaf -blades of Verbena bipinnatifida, in its most distinctive form, are usually 

 bipinnately (or sometimes palmately) cleft into narrow divisions. In its most distinctive form 

 the leaf-blades of var. gooddingii are palmately cleft but less deeply than in the species, although 

 sometimes bipinnately cleft or divided. The two forms, therefore, cannot always be distinguished 

 by leaf character. As to the corolla, this organ in var. gooddingii frequently exceeds the calyx as 

 much as it exceeds the calyx in the species. Other offered differentials seem equally inconstant. 



Loes. — Barstow, Jepson 6147 ; Gilroy Caiion, 

 Providence Mts., Jepson 18,244; Cedar Canon, Mid 

 Hills, Mary Beal ; Barnwell, New York Mts., Jepson 

 5491 ; Piute Creek, Piute Mts., N. C. Wilson 37. The 

 usual form intergrades freely into a slight leaf form, 

 scarcely worth a name, var. nepetifoi.ia (Tide- 

 strom) Jepson comb, n., leaf -blades orbicular-ovate, 

 toothed or cleft. — Eastern Mohave Desert (Lan- 

 fair, Tennent). East to Colorado and south to 

 Mexico (ace. L. M. Perry). 



Refs. — Verbena bipinnatifida Nutt., Jour. 

 Acad. Phila. 2:123 (1821), type loc. Red River, Ark., 

 Nuttall. Var. GOODDINGII Jepson. V. gooddingii 

 Briq., Ann. Conserv. et Jard. Bot. Geneve 10:103 

 (1907), type loc. Meadow Valley, Kernan, Nev., 

 Goodding 645. V. bipinnatifida Jepson, Man. 859 

 (1925) ; not Nutt. Var. nepetipolia Jepson. V. 

 gooddingii var. nepetifolia Tidestrom, Proe. Biol. 

 Soc. Wash. 38:15 (1925), type loc. El Dorado Canon, 

 se. Nev., Tidestrom 8835. 



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Fig. 421. LiPPiA NODirLOEA Michx. a, 

 habit, X yo ; ft, fl., X 3 ; c, long. sect, of 

 corolla, X 3; d, pistil, X 6; e, nutlet, X 3. 



Stamens 2, inserted on lower side of 

 Style mostly short ; stigma thickish. 



2. LIPPIA L. Mat Grass 



Prostrate perennial herbs or erect shrubs. 

 Flowers on slender axillary peduncles, dis- 

 posed in short spikes or heads and subtended 

 by broad closely imbricated bracts. Calyx 

 small and short, 2 or 4-eleft. Corolla-tube 

 cylindric, the limb bilabiate, the upper lip 

 retuse or emarginate, the lower lip 3-cleft. 

 throat. Ovary 2-celled, 1 ovule in each cell. 



oblique. Fruit with more or less corky pericarp, not readily separating into the 2 

 nutlets. — Species about 110, all continents. (Dr. A. Lippi, a French naturalist, 

 killed in Abyssinia in 1703.) 



Calyx 2-cleft, the lobes entire and lateral ; pubescence with the hairs fixed by the middle, both ends 

 acute ; prostrate herbs. 



Leaves thickish, oblanceolate or obovate, mostly obtuse at apex or shortly subacute 



1. L. nodi flora. 



Leaves thinnish, ovate, mostly acute at apex 2. L. lanceolata. 



Calyx about equally 4-cleft; pubescence with the hairs simple (fixed at one end) ; shrub; desert.... 



3. L. wrightii. 



1. L. nodiflora Michx. American Mat-grass. (Fig. 421.) Stems extensively 

 creeping, 1 to 4 feet long; herbage minutely canescent; leaf -blades cuneate-oblau- 

 ceolate or -obovate, thickish, sharply serrate towards the apex, 5 to 10 lines long, 

 sessile or shortly petioled; peduncles slender, 1 to 4 inches long, much exceeding 

 the leaves; heads eylindraceous in age, 3 to 3i,4 lines tliick; calyx-lobes low-trian- 

 gular, bearing a hairy line or band at middle; corolla white or pink, 1 to V/o lines 

 broad, the middle lobe of lower lip transversely elliptic ; fruit globose or didymous. 



