UMBELLIFER^. 261 



Order XL VIII. UMBELLIFER^. Juss. The Umbelliferous Tribe. 



Calyx adherent to the ovary ; the Hmb very small, 5-toothed or entire. Petals 

 5, usually inflexed at the jioint. Stamens 5, inserted with the petals on the 

 margm of a disk which crowns the ovary. Ovary composed of two united 

 carpels, invested with the calyx, 2-celled, with a solitary suspended anatropous 

 ovule in each cell : styles 2, their bases often united and thickened (forming a 

 stylopodium). Fruit dry, consisting of 2 indehiscent carpels (mericarps) which 

 adhere by their faces (commissure), and also to a common axis (carpophore); 

 at maturity separating from each other, and usually likewise from the axis at 

 the summit of which they are suspended. Carpels marked by several ribs or 

 \vings : in the intervening spaces (intervals) are lodged longitudinal canals or 

 receptacles (vittce),* filled wth a colored volatile oil or turpentine ; the vittse 

 are sometimes placed opposite the ribs, and in the commissure. Seeds usually 

 cohering with the carpel. Embryo minute, at the base of copious fleshy or 

 horny albumen.— Herbs, with hollow stems. Leaves mostly alternate and 

 pmnately or ternately divided ; the petioles dilated and sheathing at the base. 

 r lowers in umbels, commonly with involucres. 



CONSPECTUS OF THE SECTIONS AND TRIBES. 

 Seriea 1. ORTHOSPERM^, DC. AHmmcn fiat or jUlliik mi the face. 

 • Umbeh simple or impafcdly compound, with the partial umbels capitate. 

 Tribe I. HvDBOCOTYLE^. Fruit laterally compressed. 

 Tribe II. Sanicclej:. Fruit ovoid-o 



•• Umbels compound ; the rays more cnr less elmigated : partial umbels not capUcUe. 

 t Fruit with primary ribs only. 

 Tribe III. Ammines. Fruit compressed laterally, or didymous. 

 Tribe IV. Sesei.ine^. Fruit with the transverse section orbicular. 



Tribe V. Angelices. Fruit compressed .iorsally; the margin dilated into a double win<r 

 Tnbe VI. Pecczdaneje. Fruit compressed dorsally ; the margin dilated into a single wing, 

 ft Fruil uilh both primary and secondary ribs. 



Tribe VII. DACCujEiE. Secondary ribs mostly winged : fruit terete, or somewhat dorsally compressed ; the wings jT 



Series 2. CAMPYLOSPERM^, DC. AWumc„ u-Uh a longUudin^ groove intenuUly, or the ntargins 



Tribe VIII. ScANmciNE^E. Fruit elongated, laterally compressed, furnished with primary ribs only 

 Tnbe IX. Smyrnie*. Fruit turgid, laterally compressed, furnished with primary ribs only; 



Seric. 3. CCELOSPER.MiE, DC. AlMim^n involute at the apex and base. 

 Tribe X. CoRf ANDREW. Fruit laterally comi)rc8i«jd, didymous or globose. 



A 



' The vUta are best seen in a thin transverse slice of the fruit. They are oflen perceptible, however, externally. 



