904 COMPOSITAE. _ [Ageratum. 
1. AGERATUM Linn: | 
‘Erect herbs or rarely shrubs. Leaves opposite or the upper alternate. 
Heads usually corymbose, homogamous and discoid. Involucre campanu- 
late; bracts 2—3-seriate, linear, subequal. Receptacle flat or nearly so, 
naked or with deciduous scales among the florets. Florets all tubular, 
hermaphrodite, equal; corolla-limb regularly 5-cleft. Anthers obtuse at 
the base. Style-branches elongate, obtuse. Achenes 5-angled. Pappus 
of 5 free or connate scales, or of 10-20 narrower ones. 
A smail genus of about 35 species, confined to America with the exception of the 
following one, which is universally spread through all warm regions. | 
eye 1. A. eonyzoides Linn. Sp. Plant. (1753) 839.—-A. stout erect branch- 
ing annual herb 1-3 it. high, more or less clothed with spreading hairs. 
Leaves opposite, 1-3in. long, $-2in. broad, ovate, obtuse or subacute, 
petiolate, crenate or crenate-serrate. Flower-heads small, fin. diam., 
in dense terminal corymbs. Involucre nearly glabrous; bracts striate, 
acute, in about 2 rows.  Florets numerous, blue or white. Achenes black, 
glabrous or slightly hispid. Pappus of 5 awned lanceolate scales.—DQC. 
Prodr. v (1836) 108; Benth. Fl. Austral. iii (1866) 462; Oheesem. in Trans. 
N.Z. Inst. xx (1888) 169; 7. Kirk Students’ Fl. (1899) 256; Cheesem. Man. 
N.Z. Fl. (1906) 271. 
Kermaprc Istanps: Abundant, 7. F. C., Miss Shakespear! W. R. B. Oliver ! 
Wild Heliotrope ; Goat-weed. 
This may have been introduced by early European settlers, or by Polynesians 
when they first colonized New Zealand. ; 
See. Tians qs: I9G “Tf, 
| 2. LAGENOPHORA Cass. |! ¥1@ 
Small perennial herbs. Leaves often all radical. Scapes slender, 
unbranched. Heads solitary, small, heterogamous. Involucre short, 
almost hemispherical ; bracts in about 2 rows, with dry or scarious margins. 
Receptacle convex, naked. Ray-florets in 1-3 series, female, fertile, ligulate 
or rarely short and tubular; ligule usually white. Disc-florets numerous, 
hermaphrodite, tubular, with a broad 5-toothed limb. Anthers obtuse 
at the base. Style-branches of the disc-florets long, flattened, with lanceo 
late or triangular tips. Achenes compressed, abruptly contracted at th 
top into a more or less distinct beak ; those of the disc-florets often narrowe 
and sterile. Pappus wanting. | 
A small genus of about 18 species, mainly found in Australia and New Zealan 
but with outlying species in eastern Asia, the Sandwich Islands, and extra-tropic 
South America. 
Glabrate or pilose. Leaves mostly radical; petioles slender; blade 
orbicular or broadly oblong. Heads }-$in. diam. Achenes small, 
nearly straight : hk ie 5 a5 ~ 4. L. L. pumila. 
Glabrate or pilose, slender. Leaves mostly radical; petioles slender ; 
blade orbicular or oblong. Heads +4 in. diam. Achenes larger, 
curved or faleate  .. i ae es 7. .. 2. L. petiolata. 
Glabrate or pilose, slender. Leaves all radical; blade obovate- 
cuneate. Heads }-4in. diam. Achenes straight or nearly so .. 3. ZL. cuneata. 
Scaberulous. Leaves mostly cauline; petioles slender; blade 
oblong-spathulate. Heads }-¥in. diam. 4. L. Barkeri. 
Glabrate or pilose. Leaves mostly cauline ; petioles slender : blade 
ovate. Achene oblanceolate. 5. L. purpure 
