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MATERIILS TOWARD A MONOGRAPH OF THE GENUS VERBENA. 'IV Harold N. Moldenke VERBENA SESSILIS (Cham.) Kuntze Kuntze (1898) continues: "Schauer in DC. prod. und Flora bras-iliensis stellt noch ex descr. eine dritte Art: V. montevidensis Spr. dazu, die aber nach dem Original-Exemplar gar keine Aehn-lichkeit hat. Bei V. decurrens und sessilis sind die kopfigen Inflorescenzen sehr dicht, oben sur Bluthezeit fast flach, 2 cm breit und verjttngen aie keilig nach unten: die Bracteen sind flach, aufrecht, 1-1 1/2 cm lang in eine lange Spitze auslaufend und langhaarig gewimpert; die schlanke Corollenrohre steht 1 cm lang aus dem Kelch hervor; die Bltter sind lineallanzettig (1: 8-16) und bis 8 cm lang. Bei V. montevidensis Spr. sind die kopfigen Inflorescenzen locker und mehr oblong Uhrenartig, nur 3-5 am breit, die Bracteen sind kahnfrmnig oval acut abstehend, kaum 2 mm lang, nicht gewimpert; die breite Corollenrihre tfber-ragt den Kelch kaum; die Blatter sind oval bis breitlanzettig (1: 1 1/2-2 1/2) nur 1/2--1 1/2 cm lang." Ve_.bena sessilis inhabits swamps and swampy meadows, wet soil and wet sand, grassy fields, shrubby campos, and wet tallgrass campos, and is found along rivers and highways. Jtrgensen calls it Mcommon,. It has been collected in anthesis in January, March, May, September, and November. Rosengurtt (19h3) describes it as "Hemicript6fita, florece a fines de primavera y verano. Habita en los bafados, siendo raraa and cites hs B.2351, OH. 189,. and OHl8h95. Schnack & Covas (1946) also cite Rosengurtt B 2351 (Si), hile Briquet (1904) cites Regnell A.2039 fran Para-g . Schauer (18h7) describes our plant as "foliis sessilibus an-guste lanceolatis obsolete serratis facie strigilis subtilibus conspersisa, bracteis calyce nonnihil brevioribus". Chamisso's original description is "t ) seasilia foliis sessilibus lanceola-tis obsolete serrulatis supra pagina strigulosis. E Brasilia meridionali utramque varietatem misit Sellowius." Although these authors agree that V. sessilis differs from V. stellarioides in having its leaves merely sessile, not decurrent, narrow-lanceolate, obsoletely serrate, sparsely strigillose, and the bractlets short-er than the calyx, it seems to me that the length of the bractlets is the only dependable character for separating the two taxa. Herbarium specimens of V. sessilis have been misidentified andWidely distributed as V. stellarioides Cham. On the other hand,the following specimens were distributed or cited by me previouslyas V. sessilias but are actually V. stellarioides: JPrgensen 3773[Hear Osten 222141, Kuntze s.n., Morong 600, T. Rojas 1680 [Herb.Hasaler 1680 UHerb. Ost 8en 6S & 7 , A. G. Schulz 2$ [Herb. 1 S5-'" --

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Materials toward a monograph of the genus Verbena. XXV

H N Moldenke
Phytologia 11: 155-213 (1964)

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